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Merge pull request #931 from JordanMaples/deprecate-string_span
Deprecate string_span
This commit is contained in:
Jordan Maples [MSFT]
GitHub
commit
bd23bdc0ad
42
README.md
42
README.md
@ -27,27 +27,8 @@ Feature | Supported? | Description
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[**1. Views**][cg-views] | |
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owner | ☑ | an alias for a raw pointer
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not_null | ☑ | restricts a pointer / smart pointer to hold non-null values
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strict_not_null | ☑ | a stricter version of `not_null` with explicit constructors
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span | ☑ | a view over a contiguous sequence of memory. Based on the standardized verison of `std::span`, however `gsl::span` enforces bounds checking. See the [wiki](https://github.com/microsoft/GSL/wiki/gsl::span-and-std::span) for additional information.
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span_p | ☐ | spans a range starting from a pointer to the first place for which the predicate is true
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basic_zstring | ☑ | a pointer to a C-string (zero-terminated array) with a templated char type
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zstring | ☑ | an alias to `basic_zstring` with a char type of char
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czstring | ☑ | an alias to `basic_zstring` with a char type of const char
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wzstring | ☑ | an alias to `basic_zstring` with a char type of wchar_t
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cwzstring | ☑ | an alias to `basic_zstring` with a char type of const wchar_t
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u16zstring | ☑ | an alias to `basic_zstring` with a char type of char16_t
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cu16zstring | ☑ | an alias to `basic_zstring` with a char type of const char16_t
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u32zstring | ☑ | an alias to `basic_zstring` with a char type of char32_t
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cu32zstring | ☑ | an alias to `basic_zstring` with a char type of const char32_t
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basic_string_span | ☑ | like `span` but for strings with a templated char type
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string_span | ☑ | an alias to `basic_string_span` with a char type of char
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cstring_span | ☑ | an alias to `basic_string_span` with a char type of const char
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wstring_span | ☑ | an alias to `basic_string_span` with a char type of wchar_t
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cwstring_span | ☑ | an alias to `basic_string_span` with a char type of const wchar_t
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u16string_span | ☑ | an alias to `basic_string_span` with a char type of char16_t
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cu16string_span | ☑ | an alias to `basic_string_span` with a char type of const char16_t
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u32string_span | ☑ | an alias to `basic_string_span` with a char type of char32_t
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cu32string_span | ☑ | an alias to `basic_string_span` with a char type of const char32_t
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[**2. Owners**][cg-owners] | |
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unique_ptr | ☑ | an alias to `std::unique_ptr`
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shared_ptr | ☑ | an alias to `std::shared_ptr`
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@ -70,11 +51,30 @@ narrow_cast | ☑ | a narrowing cast for values an
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narrowing_error | ☑ | a custom exception type thrown by `narrow()`
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[**5. Concepts**][cg-concepts] | ☐ |
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## The following features do not exist in C++ Core Guidelines:
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## The following features do not exist in or have been removed from the C++ Core Guidelines:
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Feature | Supported? | Description
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-----------------------------------|:----------:|-------------
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multi_span | ☐ | Deprecated. Support for this type has been discontinued.
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strict_not_null | ☑ | A stricter version of `not_null` with explicit constructors
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multi_span | ☐ | Deprecated. Multi-dimensional span.
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strided_span | ☐ | Deprecated. Support for this type has been discontinued.
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basic_zstring | ☐ | Deprecated. A pointer to a C-string (zero-terminated array) with a templated char type
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zstring | ☐ | Deprecated. An alias to `basic_zstring` with a char type of char
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czstring | ☐ | Deprecated. An alias to `basic_zstring` with a char type of const char
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wzstring | ☐ | Deprecated. An alias to `basic_zstring` with a char type of wchar_t
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cwzstring | ☐ | Deprecated. An alias to `basic_zstring` with a char type of const wchar_t
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u16zstring | ☐ | Deprecated. An alias to `basic_zstring` with a char type of char16_t
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cu16zstring | ☐ | Deprecated. An alias to `basic_zstring` with a char type of const char16_t
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u32zstring | ☐ | Deprecated. An alias to `basic_zstring` with a char type of char32_t
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cu32zstring | ☐ | Deprecated. An alias to `basic_zstring` with a char type of const char32_t
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basic_string_span | ☐ | Deprecated. Like `span` but for strings with a templated char type
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string_span | ☐ | Deprecated. An alias to `basic_string_span` with a char type of char
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cstring_span | ☐ | Deprecated. An alias to `basic_string_span` with a char type of const char
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wstring_span | ☐ | Deprecated. An alias to `basic_string_span` with a char type of wchar_t
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cwstring_span | ☐ | Deprecated. An alias to `basic_string_span` with a char type of const wchar_t
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u16string_span | ☐ | Deprecated. An alias to `basic_string_span` with a char type of char16_t
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cu16string_span | ☐ | Deprecated. An alias to `basic_string_span` with a char type of const char16_t
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u32string_span | ☐ | Deprecated. An alias to `basic_string_span` with a char type of char32_t
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cu32string_span | ☐ | Deprecated. An alias to `basic_string_span` with a char type of const char32_t
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This is based on [CppCoreGuidelines semi-specification](https://github.com/isocpp/CppCoreGuidelines/blob/master/CppCoreGuidelines.md#gsl-guidelines-support-library).
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@ -35,9 +35,14 @@
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// Turn MSVC /analyze rules that generate too much noise. TODO: fix in the tool.
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#pragma warning(disable : 26446) // TODO: bug in parser - attributes and templates
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#pragma warning(disable : 26481) // TODO: suppress does not work inside templates sometimes
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#pragma warning(disable : 4996) // use of functions & classes marked [[deprecated]]
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#endif // _MSC_VER
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#if defined(__GNUC__) || defined(__clang__)
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
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#endif
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namespace gsl
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{
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//
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@ -52,36 +57,55 @@ namespace gsl
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//
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template <typename CharT, std::size_t Extent = dynamic_extent>
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using basic_zstring = CharT*;
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using basic_zstring [[deprecated("string_span was removed from the C++ Core Guidelines. For more "
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"information, see isocpp/CppCoreGuidelines PR#1680")]] = CharT*;
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template <std::size_t Extent = dynamic_extent>
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using czstring = basic_zstring<const char, Extent>;
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using czstring [[deprecated("string_span was removed from the C++ Core Guidelines. For more "
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"information, see isocpp/CppCoreGuidelines PR#1680")]] =
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basic_zstring<const char, Extent>;
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template <std::size_t Extent = dynamic_extent>
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using cwzstring = basic_zstring<const wchar_t, Extent>;
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using cwzstring [[deprecated("string_span was removed from the C++ Core Guidelines. For more "
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"information, see isocpp/CppCoreGuidelines PR#1680")]] =
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basic_zstring<const wchar_t, Extent>;
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template <std::size_t Extent = dynamic_extent>
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using cu16zstring = basic_zstring<const char16_t, Extent>;
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using cu16zstring [[deprecated("string_span was removed from the C++ Core Guidelines. For more "
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"information, see isocpp/CppCoreGuidelines PR#1680")]] =
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basic_zstring<const char16_t, Extent>;
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template <std::size_t Extent = dynamic_extent>
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using cu32zstring = basic_zstring<const char32_t, Extent>;
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using cu32zstring [[deprecated("string_span was removed from the C++ Core Guidelines. For more "
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"information, see isocpp/CppCoreGuidelines PR#1680")]] =
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basic_zstring<const char32_t, Extent>;
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template <std::size_t Extent = dynamic_extent>
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using zstring = basic_zstring<char, Extent>;
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using zstring [[deprecated("string_span was removed from the C++ Core Guidelines. For more "
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"information, see isocpp/CppCoreGuidelines PR#1680")]] =
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basic_zstring<char, Extent>;
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template <std::size_t Extent = dynamic_extent>
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using wzstring = basic_zstring<wchar_t, Extent>;
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using wzstring [[deprecated("string_span was removed from the C++ Core Guidelines. For more "
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"information, see isocpp/CppCoreGuidelines PR#1680")]] =
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basic_zstring<wchar_t, Extent>;
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template <std::size_t Extent = dynamic_extent>
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using u16zstring = basic_zstring<char16_t, Extent>;
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using u16zstring [[deprecated("string_span was removed from the C++ Core Guidelines. For more "
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"information, see isocpp/CppCoreGuidelines PR#1680")]] =
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basic_zstring<char16_t, Extent>;
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template <std::size_t Extent = dynamic_extent>
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using u32zstring = basic_zstring<char32_t, Extent>;
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using u32zstring [[deprecated("string_span was removed from the C++ Core Guidelines. For more "
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"information, see isocpp/CppCoreGuidelines PR#1680")]] =
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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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constexpr std::size_t string_length(const CharT* str, std::size_t n)
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[[deprecated("string_span was removed from the C++ Core Guidelines. For more information, see "
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"isocpp/CppCoreGuidelines PR#1680")]] constexpr std::size_t
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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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@ -103,29 +127,34 @@ 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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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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[[deprecated("string_span was removed from the C++ Core Guidelines. For more information, see "
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"isocpp/CppCoreGuidelines PR#1680")]] constexpr span<T, dynamic_extent>
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ensure_sentinel(T* seq, 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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GSL_SUPPRESS(
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f.23) // NO-FORMAT: attribute // TODO: false positive // TODO: suppress does not work
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// clang-format off
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GSL_SUPPRESS(f.23) // TODO: false positive // TODO: suppress does not work
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// clang-format on
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auto cur = seq;
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Ensures(cur != nullptr); // workaround for removing the warning
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GSL_SUPPRESS(bounds.1) // NO-FORMAT: attribute // TODO: suppress does not work
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// clang-format off
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GSL_SUPPRESS(bounds.1) // TODO: suppress does not work
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// clang-format on
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while (static_cast<std::size_t>(cur - seq) < max && *cur != Sentinel) ++cur;
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Ensures(*cur == Sentinel);
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return {seq, static_cast<std::size_t>(cur - seq)};
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}
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//
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// ensure_z - creates a span for a zero terminated strings. The span will not contain the zero termination.
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// Will fail fast if a null-terminator cannot be found before the limit of size_type.
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// ensure_z - creates a span for a zero terminated strings. The span will not contain the zero
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// termination. 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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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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[[deprecated("string_span was removed from the C++ Core Guidelines. For more information, see "
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"isocpp/CppCoreGuidelines PR#1680")]] constexpr span<CharT, dynamic_extent>
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ensure_z(CharT* const& sz, 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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@ -137,38 +166,48 @@ constexpr span<CharT, dynamic_extent> ensure_z(CharT (&sz)[N])
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}
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template <class Cont>
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constexpr span<typename std::remove_pointer<typename Cont::pointer>::type, dynamic_extent>
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[[deprecated(
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"string_span was removed from the C++ Core Guidelines. For more information, see "
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"isocpp/CppCoreGuidelines PR#1680")]] constexpr span<typename std::
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remove_pointer<
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typename Cont::pointer>::type,
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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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}
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template <typename CharT, std::size_t>
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class basic_string_span;
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class [[deprecated("string_span was removed from the C++ Core Guidelines. For more information, "
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"see isocpp/CppCoreGuidelines PR#1680")]] basic_string_span;
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namespace details
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{
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template <typename T>
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struct is_basic_string_span_oracle : std::false_type
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{
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};
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struct [
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[deprecated("string_span was removed from the C++ Core Guidelines. For more information, "
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"see isocpp/CppCoreGuidelines PR#1680")]] is_basic_string_span_oracle
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: std::false_type{};
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template <typename CharT, std::size_t Extent>
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struct is_basic_string_span_oracle<basic_string_span<CharT, Extent>> : std::true_type
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{
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};
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struct [[deprecated(
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"string_span was removed from the C++ Core Guidelines. For more information, see "
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"isocpp/CppCoreGuidelines PR#1680")]] is_basic_string_span_oracle<basic_string_span<CharT,
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Extent>>
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: std::true_type{};
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template <typename T>
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struct is_basic_string_span : is_basic_string_span_oracle<std::remove_cv_t<T>>
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{
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};
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struct [[deprecated("string_span was removed from the C++ Core Guidelines. For more "
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"information, see isocpp/CppCoreGuidelines PR#1680")]] is_basic_string_span
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: is_basic_string_span_oracle<std::remove_cv_t<T>>{};
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} // namespace details
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//
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// string_span and relatives
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//
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template <typename CharT, std::size_t Extent = dynamic_extent>
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class basic_string_span
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class [[deprecated("string_span was removed from the C++ Core Guidelines. For more information, "
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"see isocpp/CppCoreGuidelines PR#1680")]] basic_string_span
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{
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public:
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using element_type = CharT;
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@ -197,11 +236,11 @@ public:
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// From static arrays - if 0-terminated, remove 0 from the view
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// All other containers allow 0s within the length, so we do not remove them
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template <std::size_t N>
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constexpr basic_string_span(element_type (&arr)[N]) : span_(remove_z(arr))
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constexpr basic_string_span(element_type(&arr)[N]) : span_(remove_z(arr))
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{}
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template <std::size_t N, class ArrayElementType = std::remove_const_t<element_type>>
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constexpr basic_string_span(std::array<ArrayElementType, N>& arr) noexcept : span_(arr)
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constexpr basic_string_span(std::array<ArrayElementType, N> & arr) noexcept : span_(arr)
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{}
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template <std::size_t N, class ArrayElementType = std::remove_const_t<element_type>>
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@ -210,8 +249,8 @@ public:
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// Container signature should work for basic_string after C++17 version exists
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template <class Traits, class Allocator>
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// GSL_SUPPRESS(bounds.4) // NO-FORMAT: attribute // TODO: parser bug
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constexpr basic_string_span(std::basic_string<element_type, Traits, Allocator>& str)
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// GSL_SUPPRESS(bounds.4) // TODO: parser bug
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constexpr basic_string_span(std::basic_string<element_type, Traits, Allocator> & str)
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: span_(&str[0], str.length())
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{}
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@ -227,7 +266,7 @@ public:
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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 basic_string_span(Container& cont) : span_(cont)
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constexpr basic_string_span(Container & cont) : span_(cont)
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{}
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template <class Container,
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@ -276,8 +315,8 @@ public:
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return {span_.template subspan<Offset, Count>()};
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}
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constexpr basic_string_span<element_type, dynamic_extent>
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subspan(size_type offset, size_type count = dynamic_extent) const
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constexpr basic_string_span<element_type, dynamic_extent> subspan(
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size_type offset, size_type count = dynamic_extent) const
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{
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return {span_.subspan(offset, count)};
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}
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@ -306,7 +345,7 @@ private:
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}
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template <std::size_t N>
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static constexpr 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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@ -315,28 +354,44 @@ private:
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};
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template <std::size_t Extent = dynamic_extent>
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using string_span = basic_string_span<char, Extent>;
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using string_span [[deprecated("string_span was removed from the C++ Core Guidelines. For more "
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"information, see isocpp/CppCoreGuidelines PR#1680")]] =
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basic_string_span<char, Extent>;
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template <std::size_t Extent = dynamic_extent>
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using cstring_span = basic_string_span<const char, Extent>;
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using cstring_span [[deprecated("string_span was removed from the C++ Core Guidelines. For more "
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"information, see isocpp/CppCoreGuidelines PR#1680")]] =
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basic_string_span<const char, Extent>;
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template <std::size_t Extent = dynamic_extent>
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using wstring_span = basic_string_span<wchar_t, Extent>;
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using wstring_span [[deprecated("string_span was removed from the C++ Core Guidelines. For more "
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"information, see isocpp/CppCoreGuidelines PR#1680")]] =
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basic_string_span<wchar_t, Extent>;
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template <std::size_t Extent = dynamic_extent>
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using cwstring_span = basic_string_span<const wchar_t, Extent>;
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using cwstring_span [[deprecated("string_span was removed from the C++ Core Guidelines. For more "
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"information, see isocpp/CppCoreGuidelines PR#1680")]] =
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basic_string_span<const wchar_t, Extent>;
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template <std::size_t Extent = dynamic_extent>
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using u16string_span = basic_string_span<char16_t, Extent>;
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using u16string_span [[deprecated("string_span was removed from the C++ Core Guidelines. For more "
|
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"information, see isocpp/CppCoreGuidelines PR#1680")]] =
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basic_string_span<char16_t, Extent>;
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template <std::size_t Extent = dynamic_extent>
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using cu16string_span = basic_string_span<const char16_t, Extent>;
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using cu16string_span [[deprecated("string_span was removed from the C++ Core Guidelines. For more "
|
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"information, see isocpp/CppCoreGuidelines PR#1680")]] =
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basic_string_span<const char16_t, Extent>;
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template <std::size_t Extent = dynamic_extent>
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using u32string_span = basic_string_span<char32_t, Extent>;
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using u32string_span [[deprecated("string_span was removed from the C++ Core Guidelines. For more "
|
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"information, see isocpp/CppCoreGuidelines PR#1680")]] =
|
||||
basic_string_span<char32_t, Extent>;
|
||||
|
||||
template <std::size_t Extent = dynamic_extent>
|
||||
using cu32string_span = basic_string_span<const char32_t, Extent>;
|
||||
using cu32string_span [[deprecated("string_span was removed from the C++ Core Guidelines. For more "
|
||||
"information, see isocpp/CppCoreGuidelines PR#1680")]] =
|
||||
basic_string_span<const char32_t, Extent>;
|
||||
|
||||
//
|
||||
// to_string() allow (explicit) conversions from string_span to string
|
||||
@ -361,7 +416,9 @@ template <class ElementType, std::size_t Extent>
|
||||
constexpr basic_string_span<const byte, details::calculate_byte_size<ElementType, Extent>::value>
|
||||
as_bytes(basic_string_span<ElementType, Extent> s) noexcept
|
||||
{
|
||||
GSL_SUPPRESS(type.1) // NO-FORMAT: attribute
|
||||
// clang-format off
|
||||
GSL_SUPPRESS(type.1)
|
||||
// clang-format on
|
||||
return {reinterpret_cast<const byte*>(s.data()), s.size_bytes()};
|
||||
}
|
||||
|
||||
@ -370,14 +427,17 @@ template <class ElementType, std::size_t Extent,
|
||||
constexpr basic_string_span<byte, details::calculate_byte_size<ElementType, Extent>::value>
|
||||
as_writable_bytes(basic_string_span<ElementType, Extent> s) noexcept
|
||||
{
|
||||
GSL_SUPPRESS(type.1) // NO-FORMAT: attribute
|
||||
// clang-format off
|
||||
GSL_SUPPRESS(type.1)
|
||||
// clang-format on
|
||||
return {reinterpret_cast<byte*>(s.data()), s.size_bytes()};
|
||||
}
|
||||
|
||||
// zero-terminated string span, used to convert
|
||||
// zero-terminated spans to legacy strings
|
||||
template <typename CharT, std::size_t Extent = dynamic_extent>
|
||||
class basic_zstring_span
|
||||
class [[deprecated("string_span was removed from the C++ Core Guidelines. For more information, "
|
||||
"see isocpp/CppCoreGuidelines PR#1680")]] basic_zstring_span
|
||||
{
|
||||
public:
|
||||
using value_type = CharT;
|
||||
@ -403,7 +463,7 @@ public:
|
||||
constexpr basic_zstring_span(const basic_zstring_span& other) = default;
|
||||
|
||||
// move
|
||||
constexpr basic_zstring_span(basic_zstring_span&& other) = default;
|
||||
constexpr basic_zstring_span(basic_zstring_span && other) = default;
|
||||
|
||||
// assign
|
||||
constexpr basic_zstring_span& operator=(const basic_zstring_span& other) = default;
|
||||
@ -426,28 +486,44 @@ private:
|
||||
};
|
||||
|
||||
template <std::size_t Max = dynamic_extent>
|
||||
using zstring_span = basic_zstring_span<char, Max>;
|
||||
using zstring_span [[deprecated("string_span was removed from the C++ Core Guidelines. For more "
|
||||
"information, see isocpp/CppCoreGuidelines PR#1680")]] =
|
||||
basic_zstring_span<char, Max>;
|
||||
|
||||
template <std::size_t Max = dynamic_extent>
|
||||
using wzstring_span = basic_zstring_span<wchar_t, Max>;
|
||||
using wzstring_span [[deprecated("string_span was removed from the C++ Core Guidelines. For more "
|
||||
"information, see isocpp/CppCoreGuidelines PR#1680")]] =
|
||||
basic_zstring_span<wchar_t, Max>;
|
||||
|
||||
template <std::size_t Max = dynamic_extent>
|
||||
using u16zstring_span = basic_zstring_span<char16_t, Max>;
|
||||
using u16zstring_span [[deprecated("string_span was removed from the C++ Core Guidelines. For more "
|
||||
"information, see isocpp/CppCoreGuidelines PR#1680")]] =
|
||||
basic_zstring_span<char16_t, Max>;
|
||||
|
||||
template <std::size_t Max = dynamic_extent>
|
||||
using u32zstring_span = basic_zstring_span<char32_t, Max>;
|
||||
using u32zstring_span [[deprecated("string_span was removed from the C++ Core Guidelines. For more "
|
||||
"information, see isocpp/CppCoreGuidelines PR#1680")]] =
|
||||
basic_zstring_span<char32_t, Max>;
|
||||
|
||||
template <std::size_t Max = dynamic_extent>
|
||||
using czstring_span = basic_zstring_span<const char, Max>;
|
||||
using czstring_span [[deprecated("string_span was removed from the C++ Core Guidelines. For more "
|
||||
"information, see isocpp/CppCoreGuidelines PR#1680")]] =
|
||||
basic_zstring_span<const char, Max>;
|
||||
|
||||
template <std::size_t Max = dynamic_extent>
|
||||
using cwzstring_span = basic_zstring_span<const wchar_t, Max>;
|
||||
using cwzstring_span [[deprecated("string_span was removed from the C++ Core Guidelines. For more "
|
||||
"information, see isocpp/CppCoreGuidelines PR#1680")]] =
|
||||
basic_zstring_span<const wchar_t, Max>;
|
||||
|
||||
template <std::size_t Max = dynamic_extent>
|
||||
using cu16zstring_span = basic_zstring_span<const char16_t, Max>;
|
||||
using cu16zstring_span [[deprecated("string_span was removed from the C++ Core Guidelines. For "
|
||||
"more information, see isocpp/CppCoreGuidelines PR#1680")]] =
|
||||
basic_zstring_span<const char16_t, Max>;
|
||||
|
||||
template <std::size_t Max = dynamic_extent>
|
||||
using cu32zstring_span = basic_zstring_span<const char32_t, Max>;
|
||||
using cu32zstring_span [[deprecated("string_span was removed from the C++ Core Guidelines. For "
|
||||
"more information, see isocpp/CppCoreGuidelines PR#1680")]] =
|
||||
basic_zstring_span<const char32_t, Max>;
|
||||
|
||||
// operator ==
|
||||
template <class CharT, std::size_t Extent, class T,
|
||||
@ -703,4 +779,7 @@ bool operator>=(const T& one, gsl::basic_string_span<CharT, Extent> other)
|
||||
|
||||
#endif // _MSC_VER
|
||||
|
||||
#if defined(__GNUC__) || defined(__clang__)
|
||||
#pragma GCC diagnostic pop
|
||||
#endif
|
||||
#endif // GSL_STRING_SPAN_H
|
||||
|
||||
Loading…
Reference in New Issue
Block a user