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//===----------------------------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// <future>
// class packaged_task<R(ArgTypes...)>
// template <class F>
// explicit packaged_task(F&& f);
#include <future>
#include <cassert>
class A
{
long data_;
public:
static int n_moves;
static int n_copies;
explicit A(long i) : data_(i) {}
A(A&& a) : data_(a.data_) {++n_moves; a.data_ = -1;}
A(const A& a) : data_(a.data_) {++n_copies;}
long operator()(long i, long j) const {return data_ + i + j;}
};
int A::n_moves = 0;
int A::n_copies = 0;
int func(int i) { return i; }
int main()
{
{
std::packaged_task<double(int, char)> p(A(5));
assert(p.valid());
std::future<double> f = p.get_future();
p(3, 'a');
assert(f.get() == 105.0);
assert(A::n_copies == 0);
assert(A::n_moves > 0);
}
A::n_copies = 0;
A::n_copies = 0;
{
A a(5);
std::packaged_task<double(int, char)> p(a);
assert(p.valid());
std::future<double> f = p.get_future();
p(3, 'a');
assert(f.get() == 105.0);
assert(A::n_copies > 0);
assert(A::n_moves > 0);
}
{
std::packaged_task<int(int)> p(&func);
assert(p.valid());
std::future<int> f = p.get_future();
p(4);
assert(f.get() == 4);
}
{
std::packaged_task<int(int)> p(func);
assert(p.valid());
std::future<int> f = p.get_future();
p(4);
assert(f.get() == 4);
}
}
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