54da338f59
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@112500 91177308-0d34-0410-b5e6-96231b3b80d8
62 lines
1.4 KiB
C++
62 lines
1.4 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 distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// <future>
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// class packaged_task<R(ArgTypes...)>
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// template <class F>
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// explicit packaged_task(F&& f);
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#include <future>
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#include <cassert>
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class A
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{
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long data_;
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public:
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static int n_moves;
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static int n_copies;
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explicit A(long i) : data_(i) {}
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A(A&& a) : data_(a.data_) {++n_moves; a.data_ = -1;}
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A(const A& a) : data_(a.data_) {++n_copies;}
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long operator()(long i, long j) const {return data_ + i + j;}
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};
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int A::n_moves = 0;
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int A::n_copies = 0;
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int main()
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{
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{
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std::packaged_task<double(int, char)> p(A(5));
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assert(p);
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std::future<double> f = p.get_future();
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p(3, 'a');
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assert(f.get() == 105.0);
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assert(A::n_copies == 0);
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assert(A::n_moves > 0);
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}
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A::n_copies == 0;
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A::n_copies = 0;
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{
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A a(5);
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std::packaged_task<double(int, char)> p(a);
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assert(p);
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std::future<double> f = p.get_future();
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p(3, 'a');
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assert(f.get() == 105.0);
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assert(A::n_copies > 0);
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assert(A::n_moves > 0);
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}
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}
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