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4d6f42350e
After r289363, these tests were triggering MSVC x64 warning C4267 "conversion from 'size_t' to 'int', possible loss of data" by taking 0, 2, and 10 as std::size_t, then constructing error_code(int, const error_category&) or error_condition(int, const error_category&) from that (N4618 19.5.3.2 [syserr.errcode.constructors]/3, 19.5.4.2 [syserr.errcondition.constructors]/3). The fix is simple: take these ints as int, pass them to the int-taking constructor, and perform a value-preserving static_cast<std::size_t> when comparing them to `std::size_t result`. Fixes D27691. git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@289512 91177308-0d34-0410-b5e6-96231b3b80d8
45 lines
1.0 KiB
C++
45 lines
1.0 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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// <functional>
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// template <class T>
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// struct hash
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// : public unary_function<T, size_t>
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// {
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// size_t operator()(T val) const;
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// };
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#include <system_error>
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#include <cassert>
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#include <type_traits>
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#include "test_macros.h"
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void
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test(int i)
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{
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typedef std::error_code T;
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typedef std::hash<T> H;
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static_assert((std::is_same<H::argument_type, T>::value), "" );
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static_assert((std::is_same<H::result_type, std::size_t>::value), "" );
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H h;
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T ec(i, std::system_category());
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const std::size_t result = h(ec);
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LIBCPP_ASSERT(result == static_cast<std::size_t>(i));
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((void)result); // Prevent unused warning
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}
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int main()
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{
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test(0);
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test(2);
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test(10);
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}
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