void Core<T>::resolve(const Promise<T>& promise) {
if (_status != PENDING)
throw std::runtime_error("The promise is already resolve or reject");
Promise<T> p = promise;
Deferred<T> d(lock());
p.then([d] (const T& value) mutable {
d.resolve(value);
});
p.otherwise([d] (const std::string& err) mutable {
d.reject(err);
});
}
int main()
{
Deferred<int> defer = deferred<int>();
Promise<int> p = defer.promise();
Promise<std::string> p2 = p.then ([] (int a) -> std::string {
std::cout << "Defered was resolved with [" << a << "]" << std::endl;
return "Success";
});
p.otherwise([] (const std::string& error) -> void {
std::cout << "Defer was rejected with [" << error << "]" << std::endl;
});
auto p3 = p2.then([] (const std::string& result) -> void {
std::cout << "2nd Defer was resolved with [" << result << "]" << std::endl;
});
p2.otherwise([] ( const std::string& err) {
std::cout << "2nd Defer was rejected with [" << err << "]" << std::endl;
});
p3.then ([] (const bool& b) {
std::cout << "3rd defer resolved with [" << b << "]" << std::endl;
});
//
defer.resolve(42);
//
// OR
//
// defer.reject("There was an error");
//
}