mirror of
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d641796b21
When turning on the following flags, several additional warnings were generated, which have been cleaned up in this patch. The flags included: -Wextra -Wpedantic -Wconversion -Wsign-conversion -Wctor-dtor-privacy -Wshadow -Wnon-virtual-dtor -Wold-style-cast -Wcast-align -Woverloaded-virtual
674 lines
21 KiB
Plaintext
674 lines
21 KiB
Plaintext
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///////////////////////////////////////////////////////////////////////////////
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//
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// Copyright (c) 2015 Microsoft Corporation. All rights reserved.
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//
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// This code is licensed under the MIT License (MIT).
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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//
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///////////////////////////////////////////////////////////////////////////////
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#pragma once
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#ifndef GSL_SPAN_H
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#define GSL_SPAN_H
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#include "gsl_assert"
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#include "gsl_byte"
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#include "gsl_util"
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#include <array>
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#include <iterator>
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#include <limits>
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#include <stdexcept>
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#include <type_traits>
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#include <utility>
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#ifdef _MSC_VER
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#pragma warning(push)
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// turn off some warnings that are noisy about our Expects statements
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#pragma warning(disable : 4127) // conditional expression is constant
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// blanket turn off warnings from CppCoreCheck for now
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// so people aren't annoyed by them when running the tool.
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// more targeted suppressions will be added in a future update to the GSL
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#pragma warning(disable : 26481 26482 26483 26485 26490 26491 26492 26493 26495)
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// No MSVC does constexpr fully yet
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#pragma push_macro("constexpr")
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#define constexpr /*constexpr*/
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// VS 2013 workarounds
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#if _MSC_VER <= 1800
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#define GSL_MSVC_HAS_VARIADIC_CTOR_BUG
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#define GSL_MSVC_NO_DEFAULT_MOVE_CTOR
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#define GSL_MSVC_NO_CPP14_STD_EQUAL
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// noexcept is not understood
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#ifndef GSL_THROW_ON_CONTRACT_VIOLATION
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#pragma push_macro("noexcept")
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#define noexcept /*noexcept*/
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#endif
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#pragma push_macro("alignof")
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#define alignof __alignof
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// turn off some misguided warnings
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#pragma warning(push)
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#pragma warning(disable : 4351) // warns about newly introduced aggregate initializer behavior
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#pragma warning(disable : 4512) // warns that assignment op could not be generated
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#endif // _MSC_VER <= 1800
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#endif // _MSC_VER
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#ifdef GSL_THROW_ON_CONTRACT_VIOLATION
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#ifdef _MSC_VER
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#pragma push_macro("noexcept")
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#endif
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#define noexcept /*noexcept*/
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#endif // GSL_THROW_ON_CONTRACT_VIOLATION
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namespace gsl
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{
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// [views.constants], constants
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constexpr const std::ptrdiff_t dynamic_extent = -1;
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template <class ElementType, std::ptrdiff_t Extent = dynamic_extent>
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class span;
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// implementation details
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namespace details
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{
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template <class T>
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struct is_span_oracle : std::false_type
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{
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};
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template <class ElementType, std::ptrdiff_t Extent>
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struct is_span_oracle<gsl::span<ElementType, Extent>> : std::true_type
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{
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};
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template <class T>
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struct is_span : public is_span_oracle<std::remove_cv_t<T>>
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{
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};
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template <class T>
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struct is_std_array_oracle : std::false_type
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{
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};
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template <class ElementType, size_t Extent>
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struct is_std_array_oracle<std::array<ElementType, Extent>> : std::true_type
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{
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};
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template <class T>
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struct is_std_array : public is_std_array_oracle<std::remove_cv_t<T>>
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{
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};
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template <std::ptrdiff_t From, std::ptrdiff_t To>
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struct is_allowed_extent_conversion
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: public std::integral_constant<bool, From == To || From == gsl::dynamic_extent ||
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To == gsl::dynamic_extent>
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{
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};
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template <class From, class To>
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struct is_allowed_element_type_conversion
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: public std::integral_constant<bool, std::is_convertible<From (*)[], To (*)[]>::value>
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{
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};
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template <class Span, bool IsConst>
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class span_iterator
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{
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public:
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using iterator_category = std::random_access_iterator_tag;
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using value_type =
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std::conditional_t<IsConst, std::add_const_t<typename Span::element_type>,
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typename Span::element_type>;
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using difference_type = typename Span::index_type;
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using pointer = std::add_pointer_t<value_type>;
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using reference = std::add_lvalue_reference_t<value_type>;
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constexpr span_iterator() noexcept : span_iterator(nullptr, 0) {}
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constexpr span_iterator(const Span* span, typename Span::index_type index)
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: span_(span), index_(index)
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{
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Expects(span == nullptr || (index_ >= 0 && index <= span_->length()));
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}
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friend class span_iterator<Span, true>;
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constexpr span_iterator(const span_iterator<Span, false>& other) noexcept
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: span_iterator(other.span_, other.index_)
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{
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}
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constexpr span_iterator<Span, IsConst>& operator=(const span_iterator<Span, IsConst>&) noexcept = default;
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constexpr reference operator*() const
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{
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Expects(span_);
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return (*span_)[index_];
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}
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constexpr pointer operator->() const
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{
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Expects(span_);
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return &((*span_)[index_]);
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}
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constexpr span_iterator& operator++()
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{
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Expects(span_ && index_ >= 0 && index_ < span_->length());
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++index_;
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return *this;
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}
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constexpr span_iterator operator++(int) noexcept
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{
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auto ret = *this;
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++(*this);
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return ret;
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}
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constexpr span_iterator& operator--()
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{
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Expects(span_ && index_ > 0 && index_ <= span_->length());
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--index_;
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return *this;
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}
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constexpr span_iterator operator--(int) noexcept
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{
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auto ret = *this;
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--(*this);
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return ret;
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}
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constexpr span_iterator operator+(difference_type n) const noexcept
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{
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auto ret = *this;
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return ret += n;
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}
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constexpr span_iterator& operator+=(difference_type n)
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{
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Expects(span_ && (index_ + n) >= 0 && (index_ + n) <= span_->length());
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index_ += n;
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return *this;
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}
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constexpr span_iterator operator-(difference_type n) const noexcept
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{
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auto ret = *this;
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return ret -= n;
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}
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constexpr span_iterator& operator-=(difference_type n) noexcept { return *this += -n; }
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constexpr difference_type operator-(const span_iterator& rhs) const
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{
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Expects(span_ == rhs.span_);
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return index_ - rhs.index_;
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}
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constexpr reference operator[](difference_type n) const noexcept { return *(*this + n); }
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constexpr friend bool operator==(const span_iterator& lhs,
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const span_iterator& rhs) noexcept
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{
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return lhs.span_ == rhs.span_ && lhs.index_ == rhs.index_;
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}
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constexpr friend bool operator!=(const span_iterator& lhs,
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const span_iterator& rhs) noexcept
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{
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return !(lhs == rhs);
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}
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constexpr friend bool operator<(const span_iterator& lhs, const span_iterator& rhs)
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{
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Expects(lhs.span_ == rhs.span_);
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return lhs.index_ < rhs.index_;
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}
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constexpr friend bool operator<=(const span_iterator& lhs,
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const span_iterator& rhs) noexcept
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{
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return !(rhs < lhs);
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}
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constexpr friend bool operator>(const span_iterator& lhs, const span_iterator& rhs) noexcept
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{
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return rhs < lhs;
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}
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constexpr friend bool operator>=(const span_iterator& lhs,
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const span_iterator& rhs) noexcept
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{
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return !(rhs > lhs);
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}
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void swap(span_iterator& rhs) noexcept
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{
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std::swap(index_, rhs.index_);
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std::swap(span_, rhs.span_);
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}
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protected:
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const Span* span_;
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std::ptrdiff_t index_;
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};
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template <class Span, bool IsConst>
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constexpr span_iterator<Span, IsConst>
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operator+(typename span_iterator<Span, IsConst>::difference_type n,
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const span_iterator<Span, IsConst>& rhs) noexcept
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{
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return rhs + n;
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}
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template <class Span, bool IsConst>
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constexpr span_iterator<Span, IsConst>
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operator-(typename span_iterator<Span, IsConst>::difference_type n,
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const span_iterator<Span, IsConst>& rhs) noexcept
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{
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return rhs - n;
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}
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template <std::ptrdiff_t Ext>
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class extent_type
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{
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public:
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using index_type = std::ptrdiff_t;
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static_assert(Ext >= 0, "A fixed-size span must be >= 0 in size.");
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constexpr extent_type() noexcept {}
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template <index_type Other>
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constexpr extent_type(extent_type<Other> ext)
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{
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static_assert(Other == Ext || Other == dynamic_extent,
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"Mismatch between fixed-size extent and size of initializing data.");
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Expects(ext.size() == Ext);
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}
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constexpr extent_type(index_type size) { Expects(size == Ext); }
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constexpr inline index_type size() const noexcept { return Ext; }
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};
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template <>
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class extent_type<dynamic_extent>
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{
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public:
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using index_type = std::ptrdiff_t;
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template <index_type Other>
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explicit constexpr extent_type(extent_type<Other> ext) : size_(ext.size())
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{
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}
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explicit constexpr extent_type(index_type size) : size_(size) { Expects(size >= 0); }
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constexpr inline index_type size() const noexcept { return size_; }
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private:
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index_type size_;
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};
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} // namespace details
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// [span], class template span
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template <class ElementType, std::ptrdiff_t Extent>
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class span
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{
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public:
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// constants and types
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using element_type = ElementType;
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using index_type = std::ptrdiff_t;
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using pointer = element_type*;
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using reference = element_type&;
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using iterator = details::span_iterator<span<ElementType, Extent>, false>;
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using const_iterator = details::span_iterator<span<ElementType, Extent>, true>;
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using reverse_iterator = std::reverse_iterator<iterator>;
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using const_reverse_iterator = std::reverse_iterator<const_iterator>;
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constexpr static const index_type extent = Extent;
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// [span.cons], span constructors, copy, assignment, and destructor
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constexpr span() noexcept : storage_(nullptr, details::extent_type<0>()) {}
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constexpr span(std::nullptr_t) noexcept : span() {}
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constexpr span(pointer ptr, index_type count) : storage_(ptr, count) {}
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constexpr span(pointer firstElem, pointer lastElem)
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: storage_(firstElem, std::distance(firstElem, lastElem))
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{
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}
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template <size_t N>
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constexpr span(element_type (&arr)[N]) noexcept : storage_(&arr[0], details::extent_type<N>())
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{
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}
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template <size_t N, class ArrayElementType = std::remove_const_t<element_type>>
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constexpr span(std::array<ArrayElementType, N>& arr) noexcept
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: storage_(&arr[0], details::extent_type<N>())
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{
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}
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template <size_t N>
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constexpr span(const std::array<std::remove_const_t<element_type>, N>& arr) noexcept
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: storage_(&arr[0], details::extent_type<N>())
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{
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}
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// NB: the SFINAE here uses .data() as a incomplete/imperfect proxy for the requirement
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// on Container to be a contiguous sequence container.
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template <class Container,
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class = std::enable_if_t<
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!details::is_span<Container>::value && !details::is_std_array<Container>::value &&
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std::is_convertible<typename Container::pointer, pointer>::value &&
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std::is_convertible<typename Container::pointer,
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decltype(std::declval<Container>().data())>::value>>
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constexpr span(Container& cont) : span(cont.data(), narrow<index_type>(cont.size()))
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{
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}
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template <class Container,
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class = std::enable_if_t<
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std::is_const<element_type>::value && !details::is_span<Container>::value &&
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std::is_convertible<typename Container::pointer, pointer>::value &&
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std::is_convertible<typename Container::pointer,
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decltype(std::declval<Container>().data())>::value>>
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constexpr span(const Container& cont) : span(cont.data(), narrow<index_type>(cont.size()))
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{
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}
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constexpr span(const span& other) noexcept = default;
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#ifndef GSL_MSVC_NO_DEFAULT_MOVE_CTOR
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constexpr span(span&& other) noexcept = default;
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#else
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constexpr span(span&& other) noexcept : storage_(std::move(other.storage_)) {}
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#endif
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template <
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class OtherElementType, std::ptrdiff_t OtherExtent,
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class = std::enable_if_t<
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details::is_allowed_extent_conversion<OtherExtent, Extent>::value &&
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details::is_allowed_element_type_conversion<OtherElementType, element_type>::value>>
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constexpr span(const span<OtherElementType, OtherExtent>& other)
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: storage_(other.data(), details::extent_type<OtherExtent>(other.size()))
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{
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}
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template <
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class OtherElementType, std::ptrdiff_t OtherExtent,
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class = std::enable_if_t<
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details::is_allowed_extent_conversion<OtherExtent, Extent>::value &&
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details::is_allowed_element_type_conversion<OtherElementType, element_type>::value>>
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constexpr span(span<OtherElementType, OtherExtent>&& other)
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: storage_(other.data(), details::extent_type<OtherExtent>(other.size()))
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{
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}
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~span() noexcept = default;
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constexpr span& operator=(const span& other) noexcept = default;
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#ifndef GSL_MSVC_NO_DEFAULT_MOVE_CTOR
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constexpr span& operator=(span&& other) noexcept = default;
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#else
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constexpr span& operator=(span&& other) noexcept
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{
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storage_ = std::move(other.storage_);
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return *this;
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}
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#endif
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// [span.sub], span subviews
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template <std::ptrdiff_t Count>
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constexpr span<element_type, Count> first() const
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{
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Expects(Count >= 0 && Count <= size());
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return {data(), Count};
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}
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template <std::ptrdiff_t Count>
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constexpr span<element_type, Count> last() const
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{
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Expects(Count >= 0 && Count <= size());
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return {data() + (size() - Count), Count};
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}
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template <std::ptrdiff_t Offset, std::ptrdiff_t Count = dynamic_extent>
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constexpr span<element_type, Count> subspan() const
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{
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Expects((Offset == 0 || (Offset > 0 && Offset <= size())) &&
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(Count == dynamic_extent || (Count >= 0 && Offset + Count <= size())));
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return {data() + Offset, Count == dynamic_extent ? size() - Offset : Count};
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}
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constexpr span<element_type, dynamic_extent> first(index_type count) const
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{
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Expects(count >= 0 && count <= size());
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return {data(), count};
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}
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constexpr span<element_type, dynamic_extent> last(index_type count) const
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{
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Expects(count >= 0 && count <= size());
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return {data() + (size() - count), count};
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}
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constexpr span<element_type, dynamic_extent> subspan(index_type offset,
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index_type count = dynamic_extent) const
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{
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Expects((offset == 0 || (offset > 0 && offset <= size())) &&
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(count == dynamic_extent || (count >= 0 && offset + count <= size())));
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return {data() + offset, count == dynamic_extent ? size() - offset : count};
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}
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// [span.obs], span observers
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constexpr index_type length() const noexcept { return size(); }
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constexpr index_type size() const noexcept { return storage_.size(); }
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constexpr index_type length_bytes() const noexcept { return size_bytes(); }
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constexpr index_type size_bytes() const noexcept { return size() * narrow_cast<index_type>(sizeof(element_type)); }
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constexpr bool empty() const noexcept { return size() == 0; }
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// [span.elem], span element access
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constexpr reference operator[](index_type idx) const
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{
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Expects(idx >= 0 && idx < storage_.size());
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return data()[idx];
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}
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constexpr reference at(index_type idx) const { return this->operator[](idx); }
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constexpr reference operator()(index_type idx) const { return this->operator[](idx); }
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constexpr pointer data() const noexcept { return storage_.data(); }
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// [span.iter], span iterator support
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iterator begin() const noexcept { return {this, 0}; }
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iterator end() const noexcept { return {this, length()}; }
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const_iterator cbegin() const noexcept { return {this, 0}; }
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const_iterator cend() const noexcept { return {this, length()}; }
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reverse_iterator rbegin() const noexcept { return reverse_iterator{end()}; }
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reverse_iterator rend() const noexcept { return reverse_iterator{begin()}; }
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const_reverse_iterator crbegin() const noexcept { return const_reverse_iterator{cend()}; }
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const_reverse_iterator crend() const noexcept { return const_reverse_iterator{cbegin()}; }
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private:
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// this implementation detail class lets us take advantage of the
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// empty base class optimization to pay for only storage of a single
|
|
// pointer in the case of fixed-size spans
|
|
template <class ExtentType>
|
|
class storage_type : public ExtentType
|
|
{
|
|
public:
|
|
template <class OtherExtentType>
|
|
constexpr storage_type(pointer data, OtherExtentType ext) : ExtentType(ext), data_(data)
|
|
{
|
|
Expects((!data && ExtentType::size() == 0) || (data && ExtentType::size() >= 0));
|
|
}
|
|
|
|
constexpr inline pointer data() const noexcept { return data_; }
|
|
|
|
private:
|
|
pointer data_;
|
|
};
|
|
|
|
storage_type<details::extent_type<Extent>> storage_;
|
|
};
|
|
|
|
// [span.comparison], span comparison operators
|
|
template <class ElementType, std::ptrdiff_t FirstExtent, std::ptrdiff_t SecondExtent>
|
|
constexpr bool operator==(const span<ElementType, FirstExtent>& l,
|
|
const span<ElementType, SecondExtent>& r)
|
|
{
|
|
#ifdef GSL_MSVC_NO_CPP14_STD_EQUAL
|
|
return (l.size() == r.size()) && std::equal(l.begin(), l.end(), r.begin());
|
|
#else
|
|
return std::equal(l.begin(), l.end(), r.begin(), r.end());
|
|
#endif
|
|
}
|
|
|
|
template <class ElementType, std::ptrdiff_t Extent>
|
|
constexpr bool operator!=(const span<ElementType, Extent>& l, const span<ElementType, Extent>& r)
|
|
{
|
|
return !(l == r);
|
|
}
|
|
|
|
template <class ElementType, std::ptrdiff_t Extent>
|
|
constexpr bool operator<(const span<ElementType, Extent>& l, const span<ElementType, Extent>& r)
|
|
{
|
|
return std::lexicographical_compare(l.begin(), l.end(), r.begin(), r.end());
|
|
}
|
|
|
|
template <class ElementType, std::ptrdiff_t Extent>
|
|
constexpr bool operator<=(const span<ElementType, Extent>& l, const span<ElementType, Extent>& r)
|
|
{
|
|
return !(l > r);
|
|
}
|
|
|
|
template <class ElementType, std::ptrdiff_t Extent>
|
|
constexpr bool operator>(const span<ElementType, Extent>& l, const span<ElementType, Extent>& r)
|
|
{
|
|
return r < l;
|
|
}
|
|
|
|
template <class ElementType, std::ptrdiff_t Extent>
|
|
constexpr bool operator>=(const span<ElementType, Extent>& l, const span<ElementType, Extent>& r)
|
|
{
|
|
return !(l < r);
|
|
}
|
|
|
|
namespace details
|
|
{
|
|
// if we only supported compilers with good constexpr support then
|
|
// this pair of classes could collapse down to a constexpr function
|
|
|
|
// we should use a narrow_cast<> to go to size_t, but older compilers may not see it as
|
|
// constexpr
|
|
// and so will fail compilation of the template
|
|
template <class ElementType, std::ptrdiff_t Extent>
|
|
struct calculate_byte_size
|
|
: std::integral_constant<std::ptrdiff_t,
|
|
static_cast<std::ptrdiff_t>(sizeof(ElementType) *
|
|
static_cast<std::size_t>(Extent))>
|
|
{
|
|
};
|
|
|
|
template <class ElementType>
|
|
struct calculate_byte_size<ElementType, dynamic_extent>
|
|
: std::integral_constant<std::ptrdiff_t, dynamic_extent>
|
|
{
|
|
};
|
|
}
|
|
|
|
// [span.objectrep], views of object representation
|
|
template <class ElementType, std::ptrdiff_t Extent>
|
|
span<const byte, details::calculate_byte_size<ElementType, Extent>::value>
|
|
as_bytes(span<ElementType, Extent> s) noexcept
|
|
{
|
|
return {reinterpret_cast<const byte*>(s.data()), s.size_bytes()};
|
|
}
|
|
|
|
template <class ElementType, std::ptrdiff_t Extent,
|
|
class = std::enable_if_t<!std::is_const<ElementType>::value>>
|
|
span<byte, details::calculate_byte_size<ElementType, Extent>::value>
|
|
as_writeable_bytes(span<ElementType, Extent> s) noexcept
|
|
{
|
|
return {reinterpret_cast<byte*>(s.data()), s.size_bytes()};
|
|
}
|
|
|
|
// Specialization of gsl::at for span
|
|
template <class ElementType, std::ptrdiff_t Extent>
|
|
constexpr ElementType& at(const span<ElementType, Extent>& s, std::ptrdiff_t index)
|
|
{
|
|
// No bounds checking here because it is done in span::operator[] called below
|
|
return s[index];
|
|
}
|
|
|
|
} // namespace gsl
|
|
|
|
#ifdef _MSC_VER
|
|
|
|
#undef constexpr
|
|
#pragma pop_macro("constexpr")
|
|
|
|
#if _MSC_VER <= 1800
|
|
#pragma warning(pop)
|
|
|
|
#ifndef GSL_THROW_ON_CONTRACT_VIOLATION
|
|
#undef noexcept
|
|
#pragma pop_macro("noexcept")
|
|
#endif // GSL_THROW_ON_CONTRACT_VIOLATION
|
|
|
|
#pragma pop_macro("alignof")
|
|
|
|
#undef GSL_MSVC_HAS_VARIADIC_CTOR_BUG
|
|
|
|
#endif // _MSC_VER <= 1800
|
|
|
|
#endif // _MSC_VER
|
|
|
|
#if defined(GSL_THROW_ON_CONTRACT_VIOLATION)
|
|
|
|
#undef noexcept
|
|
|
|
#ifdef _MSC_VER
|
|
#pragma pop_macro("noexcept")
|
|
#endif
|
|
|
|
#endif // GSL_THROW_ON_CONTRACT_VIOLATION
|
|
|
|
#ifdef _MSC_VER
|
|
#pragma warning(pop)
|
|
#endif
|
|
|
|
#endif // GSL_SPAN_H
|