forked from OSchip/llvm-project
77 lines
1.2 KiB
C++
77 lines
1.2 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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// <functional>
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// reference_wrapper
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// template <class... ArgTypes>
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// requires Callable<T, ArgTypes&&...>
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// Callable<T, ArgTypes&&...>::result_type
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// operator()(ArgTypes&&... args) const;
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#include <functional>
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#include <cassert>
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// 0 args, return int
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int count = 0;
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int f_int_0()
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{
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return 3;
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}
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struct A_int_0
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{
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int operator()() {return 4;}
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};
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void
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test_int_0()
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{
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// function
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{
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std::reference_wrapper<int ()> r1(f_int_0);
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assert(r1() == 3);
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}
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// function pointer
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{
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int (*fp)() = f_int_0;
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std::reference_wrapper<int (*)()> r1(fp);
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assert(r1() == 3);
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}
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// functor
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{
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A_int_0 a0;
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std::reference_wrapper<A_int_0> r1(a0);
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assert(r1() == 4);
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}
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}
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// 1 arg, return void
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void f_void_1(int i)
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{
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count += i;
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}
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struct A_void_1
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{
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void operator()(int i)
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{
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count += i;
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}
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};
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int main()
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{
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test_int_0();
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}
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