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Add implementation for Promise type-traits functions.

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This commit is contained in:
levlam 2021-12-24 00:02:16 +03:00
parent 4791fb6a2a
commit f1707c8b4d
1 changed files with 16 additions and 5 deletions
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21
tdactor/td/actor/PromiseFuture.h
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@ -184,23 +184,33 @@ class SafePromise;
template <class T = Unit>
class Promise;
constexpr std::false_type is_promise_interface(...);
constexpr inline std::false_type is_promise_interface(...) {
return {};
}
template <class T>
constexpr std::true_type is_promise_interface(const PromiseInterface<T> &promise);
constexpr std::true_type is_promise_interface(const PromiseInterface<T> &promise) {
return {};
}
template <class T>
constexpr std::true_type is_promise_interface(const Promise<T> &promise);
constexpr std::true_type is_promise_interface(const Promise<T> &promise) {
return {};
}
template <class F>
constexpr bool is_promise_interface() {
return decltype(is_promise_interface(std::declval<F>()))::value;
}
constexpr std::false_type is_promise_interface_ptr(...);
constexpr inline std::false_type is_promise_interface_ptr(...) {
return {};
}
template <class T>
constexpr std::true_type is_promise_interface_ptr(const unique_ptr<T> &promise);
constexpr std::true_type is_promise_interface_ptr(const unique_ptr<T> &promise) {
return {};
}
template <class F>
constexpr bool is_promise_interface_ptr() {
@ -231,6 +241,7 @@ template <class T, class F, std::enable_if_t<is_promise_interface_ptr<F>(), bool
auto promise_interface_ptr(F &&f) {
return std::forward<F>(f);
}
template <class T, class F, std::enable_if_t<!is_promise_interface_ptr<F>(), bool> from_promise_interface = false>
auto promise_interface_ptr(F &&f) {
return td::make_unique<std::decay_t<decltype(promise_interface<T>(std::forward<F>(f)))>>(