5fd17ab1b0
<string.h> and wcschr, wcspbrk, wcsrchr, wmemchr, and wcsstr from <wchar.h> to provide a const-correct overload set even when the underlying C library does not. This change adds a new macro, _LIBCPP_PREFERRED_OVERLOAD, which (if defined) specifies that a given overload is a better match than an otherwise equally good function declaration without the overload. This is implemented in modern versions of Clang via __attribute__((enable_if)), and not elsewhere. We use this new macro to define overloads in the global namespace for these functions that displace the overloads provided by the C library, unless we believe the C library is already providing the correct signatures. llvm-svn: 260337
62 lines
3.2 KiB
C++
62 lines
3.2 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// <cstring>
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#include <cstring>
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#include <type_traits>
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#ifndef NULL
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#error NULL not defined
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#endif
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int main()
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{
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std::size_t s = 0;
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void* vp = 0;
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const void* vpc = 0;
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char* cp = 0;
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const char* cpc = 0;
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static_assert((std::is_same<decltype(std::memcpy(vp, vpc, s)), void*>::value), "");
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static_assert((std::is_same<decltype(std::memmove(vp, vpc, s)), void*>::value), "");
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static_assert((std::is_same<decltype(std::strcpy(cp, cpc)), char*>::value), "");
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static_assert((std::is_same<decltype(std::strncpy(cp, cpc, s)), char*>::value), "");
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static_assert((std::is_same<decltype(std::strcat(cp, cpc)), char*>::value), "");
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static_assert((std::is_same<decltype(std::strncat(cp, cpc, s)), char*>::value), "");
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static_assert((std::is_same<decltype(std::memcmp(vpc, vpc, s)), int>::value), "");
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static_assert((std::is_same<decltype(std::strcmp(cpc, cpc)), int>::value), "");
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static_assert((std::is_same<decltype(std::strncmp(cpc, cpc, s)), int>::value), "");
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static_assert((std::is_same<decltype(std::strcoll(cpc, cpc)), int>::value), "");
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static_assert((std::is_same<decltype(std::strxfrm(cp, cpc, s)), std::size_t>::value), "");
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static_assert((std::is_same<decltype(std::memchr(vp, 0, s)), void*>::value), "");
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static_assert((std::is_same<decltype(std::strchr(cp, 0)), char*>::value), "");
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static_assert((std::is_same<decltype(std::strcspn(cpc, cpc)), std::size_t>::value), "");
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static_assert((std::is_same<decltype(std::strpbrk(cp, cpc)), char*>::value), "");
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static_assert((std::is_same<decltype(std::strrchr(cp, 0)), char*>::value), "");
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static_assert((std::is_same<decltype(std::strspn(cpc, cpc)), std::size_t>::value), "");
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static_assert((std::is_same<decltype(std::strstr(cp, cpc)), char*>::value), "");
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#ifndef _LIBCPP_HAS_NO_THREAD_UNSAFE_C_FUNCTIONS
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static_assert((std::is_same<decltype(std::strtok(cp, cpc)), char*>::value), "");
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#endif
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static_assert((std::is_same<decltype(std::memset(vp, 0, s)), void*>::value), "");
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static_assert((std::is_same<decltype(std::strerror(0)), char*>::value), "");
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static_assert((std::is_same<decltype(std::strlen(cpc)), std::size_t>::value), "");
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// These tests fail on systems whose C library doesn't provide a correct overload
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// set for strchr, strpbrk, strrchr, strstr, and memchr, unless the compiler is
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// a suitably recent version of Clang.
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#if !defined(__APPLE__) || defined(_LIBCPP_PREFERRED_OVERLOAD)
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static_assert((std::is_same<decltype(std::memchr(vpc, 0, s)), const void*>::value), "");
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static_assert((std::is_same<decltype(std::strchr(cpc, 0)), const char*>::value), "");
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static_assert((std::is_same<decltype(std::strpbrk(cpc, cpc)), const char*>::value), "");
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static_assert((std::is_same<decltype(std::strrchr(cpc, 0)), const char*>::value), "");
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static_assert((std::is_same<decltype(std::strstr(cpc, cpc)), const char*>::value), "");
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#endif
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}
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