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Provide definitions for std::size_t and std::ptrdiff_t through type deduction #5699

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Provide definitions for std::size_t and std::ptrdiff_t through type deduction #5699

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5 changes: 3 additions & 2 deletions stl/inc/cstddef
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Expand Up @@ -25,8 +25,9 @@ _STL_DISABLE_CLANG_WARNINGS
#undef intrinsic

_STD_BEGIN
_EXPORT_STD using _CSTD ptrdiff_t;
_EXPORT_STD using _CSTD size_t;
// using deduction to define size_t and ptrdiff_t for better diagnostics, see GH-5699
_EXPORT_STD using ptrdiff_t = decltype((int*) (nullptr) - (int*) (nullptr));
_EXPORT_STD using size_t = decltype(sizeof(0));
_EXPORT_STD using max_align_t = double; // most aligned type
_EXPORT_STD using nullptr_t = decltype(nullptr);

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2 changes: 1 addition & 1 deletion stl/inc/cstdio
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Expand Up @@ -32,7 +32,7 @@ _STD_BEGIN

using _CSTD _Mbstatet;

_EXPORT_STD using _CSTD size_t;
_EXPORT_STD using size_t = decltype(sizeof(0));
_EXPORT_STD using _CSTD fpos_t;
_EXPORT_STD using _CSTD FILE;
_EXPORT_STD using _CSTD clearerr;
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2 changes: 1 addition & 1 deletion stl/inc/cstdlib
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Expand Up @@ -34,7 +34,7 @@ _NODISCARD _Check_return_ inline long double abs(_In_ long double _Xx) noexcept
_END_EXTERN_CXX_WORKAROUND

_STD_BEGIN
_EXPORT_STD using _CSTD size_t;
_EXPORT_STD using size_t = decltype(sizeof(0));
_EXPORT_STD using _CSTD div_t;
_EXPORT_STD using _CSTD ldiv_t;
_EXPORT_STD using _CSTD abort;
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2 changes: 1 addition & 1 deletion stl/inc/cstring
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Expand Up @@ -21,7 +21,7 @@ _STD_BEGIN
#pragma warning(push)
#pragma warning(disable : 4995) // name was marked as #pragma deprecated

_EXPORT_STD using _CSTD size_t;
_EXPORT_STD using size_t = decltype(sizeof(0));
_EXPORT_STD using _CSTD memchr;
_EXPORT_STD using _CSTD memcmp;
_EXPORT_STD using _CSTD memcpy;
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2 changes: 1 addition & 1 deletion stl/inc/ctime
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Expand Up @@ -19,7 +19,7 @@ _STL_DISABLE_CLANG_WARNINGS

_STD_BEGIN
_EXPORT_STD using _CSTD clock_t;
_EXPORT_STD using _CSTD size_t;
_EXPORT_STD using size_t = decltype(sizeof(0));
_EXPORT_STD using _CSTD time_t;
_EXPORT_STD using _CSTD tm;
_EXPORT_STD using _CSTD asctime;
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2 changes: 1 addition & 1 deletion stl/inc/cuchar
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Expand Up @@ -19,7 +19,7 @@ _STL_DISABLE_CLANG_WARNINGS

_STD_BEGIN
_EXPORT_STD using _CSTD mbstate_t;
_EXPORT_STD using _CSTD size_t;
_EXPORT_STD using size_t = decltype(sizeof(0));
_EXPORT_STD using _CSTD mbrtoc16;
_EXPORT_STD using _CSTD c16rtomb;
_EXPORT_STD using _CSTD mbrtoc32;
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2 changes: 1 addition & 1 deletion stl/inc/cwchar
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Expand Up @@ -29,7 +29,7 @@ _STD_BEGIN
using _CSTD _Mbstatet;

_EXPORT_STD using _CSTD mbstate_t;
_EXPORT_STD using _CSTD size_t;
_EXPORT_STD using size_t = decltype(sizeof(0));
_EXPORT_STD using _CSTD tm;
_EXPORT_STD using _CSTD wint_t;

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