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generator.h
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generator.h
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#pragma once
#include <coroutine>
#include <exception>
namespace midiSearch {
//封装generator
template <typename T>
class generator {
public:
struct promise_type {
generator get_return_object() {
return generator{handle_type::from_promise(*this)};
}
static generator get_return_object_on_allocation_failure() {
return generator{nullptr};
}
auto initial_suspend() {
return std::suspend_always{};
}
auto final_suspend() noexcept {
return std::suspend_always{};
}
auto yield_value(T value) {
current_value = value;
return std::suspend_always{};
}
void return_void() {}
void unhandled_exception() {
std::terminate();
}
T current_value;
};
using handle_type = std::coroutine_handle<promise_type>;
struct iterator_end {};
struct iterator {
iterator(handle_type handle_)
: handle(handle_) {}
void operator++() {
handle.resume();
}
T operator*() {
return std::move(handle.promise().current_value);
}
bool operator==(iterator_end) {
return handle.done();
}
bool operator!=(iterator_end) {
return !handle.done();
}
handle_type handle;
};
generator(handle_type handle_)
: handle(handle_) {}
generator(const generator& other) = delete;
generator(generator&& other) noexcept
: handle(other.handle) {
other.handle = nullptr;
}
~generator() {
if (handle) {
handle.destroy();
}
}
bool has_next() {
if (handle) {
handle.resume();
return !handle.done();
}
return false;
}
T get_value() {
return std::move(handle.promise().current_value);
}
iterator begin() {
handle.resume();
return iterator{handle};
}
iterator_end end() {
return iterator_end{};
}
private:
handle_type handle;
};
} // namespace midiSearch