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
38 lines
967 B
C++
38 lines
967 B
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=16385
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#include <functional>
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#include <cmath>
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#include <cassert>
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float _pow(float a, float b)
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{
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return std::pow(a, b);
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}
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int main()
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{
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std::function<float(float, float)> fnc = _pow;
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auto task = std::bind(fnc, 2.f, 4.f);
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auto task2(task);
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assert(task() == 16);
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assert(task2() == 16);
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}
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