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Merge pull request #922 from JordanMaples/constexpr-string_span
constexpr string_span
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commit
d58e50c6f4
@ -81,7 +81,7 @@ using u32zstring = basic_zstring<char32_t, Extent>;
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namespace details
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{
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template <class CharT>
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std::size_t string_length(const CharT* str, std::size_t n)
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constexpr std::size_t string_length(const CharT* str, std::size_t n)
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{
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if (str == nullptr || n == dynamic_extent) return 0;
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@ -103,7 +103,7 @@ namespace details
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// Will fail-fast if sentinel cannot be found before max elements are examined.
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//
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template <typename T, const T Sentinel>
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span<T, dynamic_extent> ensure_sentinel(T* seq,
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constexpr span<T, dynamic_extent> ensure_sentinel(T* seq,
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std::size_t max = static_cast<std::size_t>(-1))
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{
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Ensures(seq != nullptr);
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@ -124,20 +124,20 @@ span<T, dynamic_extent> ensure_sentinel(T* seq,
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// Will fail fast if a null-terminator cannot be found before the limit of size_type.
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//
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template <typename CharT>
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span<CharT, dynamic_extent> ensure_z(CharT* const& sz,
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constexpr span<CharT, dynamic_extent> ensure_z(CharT* const& sz,
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std::size_t max = static_cast<std::size_t>(-1))
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{
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return ensure_sentinel<CharT, CharT(0)>(sz, max);
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}
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template <typename CharT, std::size_t N>
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span<CharT, dynamic_extent> ensure_z(CharT (&sz)[N])
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constexpr span<CharT, dynamic_extent> ensure_z(CharT (&sz)[N])
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{
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return ensure_z(&sz[0], N);
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}
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template <class Cont>
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span<typename std::remove_pointer<typename Cont::pointer>::type, dynamic_extent>
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constexpr span<typename std::remove_pointer<typename Cont::pointer>::type, dynamic_extent>
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ensure_z(Cont& cont)
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{
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return ensure_z(cont.data(), cont.size());
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@ -300,13 +300,13 @@ public:
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constexpr reverse_iterator rend() const noexcept { return span_.rend(); }
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private:
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static impl_type remove_z(pointer const& sz, std::size_t max)
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static constexpr impl_type remove_z(pointer const& sz, std::size_t max)
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{
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return impl_type(sz, details::string_length(sz, max));
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}
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template <std::size_t N>
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static impl_type remove_z(element_type (&sz)[N])
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static constexpr impl_type remove_z(element_type (&sz)[N])
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{
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return remove_z(&sz[0], N);
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}
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@ -343,7 +343,7 @@ using cu32string_span = basic_string_span<const char32_t, Extent>;
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//
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template <typename CharT, std::size_t Extent>
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std::basic_string<typename std::remove_const<CharT>::type>
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constexpr std::basic_string<typename std::remove_const<CharT>::type>
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to_string(basic_string_span<CharT, Extent> view)
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{
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return {view.data(), narrow_cast<std::size_t>(view.length())};
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@ -351,13 +351,14 @@ to_string(basic_string_span<CharT, Extent> view)
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template <typename CharT, typename Traits = typename std::char_traits<CharT>,
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typename Allocator = std::allocator<CharT>, typename gCharT, std::size_t Extent>
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std::basic_string<CharT, Traits, Allocator> to_basic_string(basic_string_span<gCharT, Extent> view)
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constexpr std::basic_string<CharT, Traits, Allocator>
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to_basic_string(basic_string_span<gCharT, Extent> view)
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{
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return {view.data(), narrow_cast<std::size_t>(view.length())};
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}
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template <class ElementType, std::size_t Extent>
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basic_string_span<const byte, details::calculate_byte_size<ElementType, Extent>::value>
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constexpr basic_string_span<const byte, details::calculate_byte_size<ElementType, Extent>::value>
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as_bytes(basic_string_span<ElementType, Extent> s) noexcept
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{
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GSL_SUPPRESS(type.1) // NO-FORMAT: attribute
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@ -366,7 +367,7 @@ as_bytes(basic_string_span<ElementType, Extent> s) noexcept
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template <class ElementType, std::size_t Extent,
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class = std::enable_if_t<!std::is_const<ElementType>::value>>
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basic_string_span<byte, details::calculate_byte_size<ElementType, Extent>::value>
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constexpr basic_string_span<byte, details::calculate_byte_size<ElementType, Extent>::value>
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as_writable_bytes(basic_string_span<ElementType, Extent> s) noexcept
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{
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GSL_SUPPRESS(type.1) // NO-FORMAT: attribute
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