9d3d032c7d
Instead, define explicit specializations for the basic types listed in
the SGI documentation. This solves two problems:
1) Helps avoid silent ODR violations caused by the absence of a
user-supplied __gnu_cxx::hash specialization in cases where a std::hash
specialization exists (e.g. for std::string).
2) __gnu_cxx::hash semantics are slightly different to those of
std::hash (for example, the former may dereference a pointer argument)
so it is inappropriate for __gnu_cxx::hash to receive std::hash
specializations by default.
Differential Revision: http://llvm-reviews.chandlerc.com/D2747
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@203070 91177308-0d34-0410-b5e6-96231b3b80d8
30 lines
1.1 KiB
C++
30 lines
1.1 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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#include <assert.h>
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#include <ext/hash_map>
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#include <string>
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int main()
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{
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char str[] = "test";
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assert(__gnu_cxx::hash<const char *>()("test") ==
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std::hash<std::string>()("test"));
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assert(__gnu_cxx::hash<char *>()(str) == std::hash<std::string>()("test"));
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assert(__gnu_cxx::hash<char>()(42) == 42);
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assert(__gnu_cxx::hash<signed char>()(42) == 42);
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assert(__gnu_cxx::hash<unsigned char>()(42) == 42);
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assert(__gnu_cxx::hash<short>()(42) == 42);
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assert(__gnu_cxx::hash<unsigned short>()(42) == 42);
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assert(__gnu_cxx::hash<int>()(42) == 42);
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assert(__gnu_cxx::hash<unsigned int>()(42) == 42);
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assert(__gnu_cxx::hash<long>()(42) == 42);
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assert(__gnu_cxx::hash<unsigned long>()(42) == 42);
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}
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