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/*
* Copyright (C) 2024 Mikhail Burakov. This file is part of streamer.
*
* streamer is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* streamer is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with streamer. If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef STREAMER_UTIL_H_
#define STREAMER_UTIL_H_
#define STR_IMPL(x) #x
#define STR(x) STR_IMPL(x)
#define FROM_HERE __FILE__ ":" STR(__LINE__) " "
template <class T>
struct Defer {
Defer(T&& op) : op_{op} {}
~Defer() { op_(); }
const T& op_;
};
template <class T>
Defer(T&&) -> Defer<T>;
template <auto dflt, auto closer>
struct PodCloser {
struct pointer {
decltype(dflt) value_;
pointer() : value_{dflt} {}
pointer(decltype(nullptr)) : value_{dflt} {}
pointer(decltype(dflt) value) : value_{value} {}
explicit operator bool() const { return value_ != dflt; }
friend bool operator==(pointer, pointer) = default;
operator decltype(dflt)() const { return value_; }
};
void operator()(const pointer ptr) {
if (ptr.value_ != dflt) closer(ptr.value_);
}
};
template <class T>
struct ClassOf;
template <class R, class C>
struct ClassOf<R C::*> {
using T = C;
};
template <auto fun, class T, class... Args>
inline auto Trampoline(T* head, Args... tail) {
using C = ClassOf<decltype(fun)>::T;
auto self = static_cast<C*>(head);
return (self->*fun)(tail...);
}
#endif // STREAMER_UTIL_H_
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