45f63bc07e
<__functional_03> provides the C++03 definitions for std::memfun and std::function. However the interaction between <functional> and <__functional_03> is ugly and duplicates code needlessly. This patch cleans up how the two headers work together. The major changes are: - Provide placeholders, is_bind_expression and is_placeholder in <functional> for both C++03 and C++11. - Provide bad_function_call, function fwd decl, __maybe_derive_from_unary_function and __maybe_derive_from_binary_function in <functional> for both C++03 and C++11. - Move the <__functional_03> include to the bottom of <functional>. This makes it easier to see how <__functional_03> interacts with <functional> - Remove a commented out implementation of bind in C++03. It's never going to get implemented. - Mark almost all std::bind tests as unsupported in C++03. std::is_placeholder works in C++03 and C++11. std::is_bind_expression is provided in C++03 but always returns false. git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@242870 91177308-0d34-0410-b5e6-96231b3b80d8
54 lines
1.1 KiB
C++
54 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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// UNSUPPORTED: c++98, c++03
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// <functional>
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// template<CopyConstructible Fn, CopyConstructible... Types>
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// unspecified bind(Fn, Types...);
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// template<Returnable R, CopyConstructible Fn, CopyConstructible... Types>
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// unspecified bind(Fn, Types...);
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// http://llvm.org/bugs/show_bug.cgi?id=16343
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#include <cmath>
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#include <functional>
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#include <cassert>
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struct power
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{
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template <typename T>
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T
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operator()(T a, T b)
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{
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return std::pow(a, b);
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}
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};
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struct plus_one
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{
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template <typename T>
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T
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operator()(T a)
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{
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return a + 1;
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}
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};
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int
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main()
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{
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using std::placeholders::_1;
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auto g = std::bind(power(), 2, _1);
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assert(g(5) == 32);
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assert(std::bind(plus_one(), g)(5) == 33);
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}
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