For experimenting with object lifetime, use the following and run the code. Most helpful for godbolt/compiler explorer and small experiments.
C++23:
#include <stacktrace>
#include <source_location>
#include <iostream>
void print_context_impl(const std::source_location &loc = std::source_location::current()) noexcept {
std::cout << loc.function_name() << std::stacktrace::current(2, 1);
}
//#define print_context(...)
#define print_context(...) print_context_impl(__VA_ARGS__)
class Lifetime {
public:
Lifetime() noexcept { print_context(); }
Lifetime(int) noexcept { print_context(); }
Lifetime(const Lifetime&) noexcept { print_context(); }
Lifetime(Lifetime&&) noexcept { print_context(); }
~Lifetime() noexcept { print_context(); }
Lifetime& operator=(const Lifetime&) noexcept { print_context(); return *this; }
Lifetime& operator=(Lifetime&&) noexcept { print_context(); return *this; }
};Previous standards:
class Lifetime {
public:
Lifetime() noexcept { std::puts(__FUNCTION__); }
Lifetime(int) noexcept { std::puts(__FUNCTION__); }
Lifetime(const Lifetime&) noexcept { std::puts(__FUNCTION__); }
Lifetime(Lifetime&&) noexcept { std::puts(__FUNCTION__); }
~Lifetime() noexcept { std::puts(__FUNCTION__); }
Lifetime& operator=(const Lifetime&) noexcept { std::puts(__FUNCTION__); return *this; }
Lifetime& operator=(Lifetime&&) noexcept { std::puts(__FUNCTION__); return *this; }
};