BlackMATov/promise.hpp
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make_promise function also can create pending promises

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Matvey Cherevko
2018-12-09 22:45:05 +07:00
parent 1148557b2f
commit e1af6f13ac
2 changed files with 24 additions and 0 deletions
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5
promise.hpp
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@@ -656,6 +656,11 @@ namespace promise_hpp
// make_promise // make_promise
// //
template < typename R >
promise<R> make_promise() {
return promise<R>();
}
template < typename R, typename F > template < typename R, typename F >
promise<R> make_promise(F&& f) { promise<R> make_promise(F&& f) {
promise<R> result; promise<R> result;

19
tests.cpp
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@@ -426,6 +426,25 @@ TEST_CASE("promise") {
REQUIRE(check_84_int == 84); REQUIRE(check_84_int == 84);
} }
} }
SECTION("lazy_chaining") {
{
int check_84_int = 0;
auto p1 = pr::make_promise<int>();
auto p2 = pr::make_promise<int>();
p1.then([&p2](int v){
return p2;
}).then([&check_84_int](int v2){
check_84_int = v2;
});
REQUIRE(check_84_int == 0);
p1.resolve(42);
REQUIRE(check_84_int == 0);
p2.resolve(84);
REQUIRE(check_84_int == 84);
}
}
SECTION("typed_chaining_fails") { SECTION("typed_chaining_fails") {
{ {
bool call_fail_with_logic_error = false; bool call_fail_with_logic_error = false;