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#pragma once
#include <functional>
#include <string>
#include "../memory/Memory.hpp"
// TODO: move into hyprutils
template <typename T>
class CPromise;
template <typename T>
class CPromiseResult;
template <typename T>
class CPromiseResolver {
public:
CPromiseResolver(const CPromiseResolver&) = delete;
CPromiseResolver(CPromiseResolver&&) = delete;
CPromiseResolver& operator=(const CPromiseResolver&) = delete;
CPromiseResolver& operator=(CPromiseResolver&&) = delete;
void resolve(T value) {
if (m_promise->m_result)
return;
m_promise->m_result = CPromiseResult<T>::result(value);
if (!m_promise->m_then)
return;
m_promise->m_then(m_promise->m_result);
}
void reject(const std::string& reason) {
if (m_promise->m_result)
return;
m_promise->m_result = CPromiseResult<T>::err(reason);
if (!m_promise->m_then)
return;
m_promise->m_then(m_promise->m_result);
}
private:
CPromiseResolver(SP<CPromise<T>> promise) : m_promise(promise) {}
SP<CPromise<T>> m_promise;
friend class CPromise<T>;
};
template <typename T>
class CPromiseResult {
public:
bool hasError() {
return m_hasError;
}
T result() {
return m_result;
}
std::string error() {
return m_error;
}
private:
static SP<CPromiseResult<T>> result(T result) {
auto p = SP<CPromiseResult<T>>(new CPromiseResult<T>());
p->m_result = result;
return p;
}
static SP<CPromiseResult<T>> err(std::string reason) {
auto p = SP<CPromiseResult<T>>(new CPromiseResult<T>());
p->m_error = reason;
p->m_hasError = true;
return p;
}
T m_result = {};
std::string m_error = {};
bool m_hasError = false;
friend class CPromiseResolver<T>;
};
template <typename T>
class CPromise {
public:
CPromise(const CPromise&) = delete;
CPromise(CPromise&&) = delete;
CPromise& operator=(const CPromise&) = delete;
CPromise& operator=(CPromise&&) = delete;
static SP<CPromise> make(const std::function<void(SP<CPromiseResolver<T>>)>& fn) {
auto sp = SP<CPromise<T>>(new CPromise<T>());
fn(SP<CPromiseResolver<T>>(new CPromiseResolver<T>(sp)));
return sp;
}
void then(std::function<void(SP<CPromiseResult<T>>)>&& fn) {
m_then = std::move(fn);
if (m_result)
m_then(m_result);
}
private:
CPromise() = default;
const std::function<void(SP<CPromiseResult<T>>)> m_fn;
std::function<void(SP<CPromiseResult<T>>)> m_then;
SP<CPromiseResult<T>> m_result;
friend class CPromiseResult<T>;
friend class CPromiseResolver<T>;
};
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