dxx.overload Module Reference

overload pattern with a few bells and whistles More...

Classes
struct	dxx::overload::overload< Ts >
	Overload pattern implementation. Itself does not differ from https://www.cppstories.com/2019/02/2lines3featuresoverload.html/, extra functionality comes from CTAD. See module description for usage. More...

Detailed Description

overload pattern with a few bells and whistles

Supports, aside from resgular function-like objects, free and member function pointers:

struct S {
    void f()    const { std::println("S::f()");    }
    void g(int) const { std::println("S::g(int)"); }
};
 
void h(const S&, float) { std::println("h(const S&, float)"); }
 
// ... someplace else
 
const dxx::overload::overload callback{
    [] (int i) { std::println("lambda"); },
    &S::f,
    &S::g,
    h,
}; // <-- const overload callback
 
callback(10);         // lambda
callback(S{});        // S::f()
callback(S{}, 10);    // S::g(int)
callback(S{}, 10.0f); // h(const S&, float)

There is also a utility operator| for the overload that automatically calls std::visit:

std::variant<int, S>{ 10 } | callback;

Files
file	/build-llvm-libcpp/_deps/dot-xx-overload-src/src/overload.xx
	Main interface file of dxx::overload module.