cpp-cheat/cpp/implicitly_defined.cpp at b5289bc0ccd7de65edb07b1e8bfdfde82b9ebdd9 · modulexcite/cpp-cheat

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// # Implicitly defined functions

// - https://stackoverflow.com/questions/12340257/default-vs-implicit-constructor-in-c

// - https://blog.mozilla.org/nfroyd/2015/08/20/explicit-is-better-than-implicit-c-implicitly-defined-member-functions/

// - https://stackoverflow.com/questions/3734247/what-are-all-the-member-functions-created-by-compiler-for-a-class-does-that-hap

// - https://stackoverflow.com/questions/4943958/conditions-for-automatic-generation-of-default-copy-move-ctor-and-copy-move-assi

// - https://en.cppreference.com/w/cpp/language/copy_constructor

// - https://en.cppreference.com/w/cpp/language/move_constructor

// - https://en.cppreference.com/w/cpp/language/copy_assignment

// - https://en.cppreference.com/w/cpp/language/move_assignment

#include "common.hpp"

struct Default {

int i;

Default() = default;

Default(const Default&) = default;

Default& operator=(Default&) = default;

Default& operator=(const Default&) = default;

Default(Default&&) = default;

Default& operator=(Default&&) = default;

~Default() = default;

};

struct Instrument {

int i;

static std::vector<std::string> calls;

Instrument() { calls.push_back("ctor"); }

Instrument(const Instrument&) { calls.push_back("copy ctor"); }

Instrument& operator=(Instrument&) { calls.push_back("copy assign"); return *this; }

Instrument& operator=(const Instrument&) { calls.push_back("copy assign const"); return *this; }

Instrument(Instrument&&) { calls.push_back("move ctor"); }

Instrument& operator=(Instrument&&) { calls.push_back("move assign"); return *this; }

~Instrument() { calls.push_back("dtor"); }

};

std::vector<std::string> Instrument::calls;

int main() {

Instrument i;

assert(Instrument::calls.back() == "ctor");

}