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test_promise.cpp
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test_promise.cpp
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#include <experimental/future>
#include <cassert>
#include <iostream>
void test()
{
{
// test non-void get_future
std::experimental::promise<int> p;
std::experimental::future<int> f = p.get_future();
assert(f.valid());
try
{
std::experimental::future<int> f = p.get_future();
assert(0);
}
catch(std::future_error e)
{
assert(e.code() == std::future_errc::future_already_retrieved);
}
catch(...)
{
assert(0);
}
}
{
// test void get_future
std::experimental::promise<void> p;
std::experimental::future<void> f = p.get_future();
assert(f.valid());
try
{
std::experimental::future<void> f = p.get_future();
assert(0);
}
catch(std::future_error e)
{
assert(e.code() == std::future_errc::future_already_retrieved);
}
catch(...)
{
assert(0);
}
}
{
// test non-void set_value() / .get()
std::experimental::promise<int> p;
int expected_result = 13;
p.set_value(expected_result);
int result = p.get_future().get();
assert(expected_result == result);
}
{
// test void set_value() / .get();
std::experimental::promise<void> p;
p.set_value();
p.get_future().get();
}
{
// test non-void superfluous set_value()
std::experimental::promise<int> p;
p.set_value(13);
try
{
// calling set_value() again should throw promise_already_satisfied
p.set_value(13);
assert(0);
}
catch(std::future_error e)
{
assert(e.code() == std::future_errc::promise_already_satisfied);
}
catch(...)
{
assert(0);
}
}
{
// test void superfluous set_value()
std::experimental::promise<void> p;
p.set_value();
try
{
// calling set_value() again should throw promise_already_satisfied
p.set_value();
assert(0);
}
catch(std::future_error e)
{
assert(e.code() == std::future_errc::promise_already_satisfied);
}
catch(...)
{
assert(0);
}
}
}
int main()
{
test();
std::cout << "OK" << std::endl;
}