Simple implementation for partial function application in C++ (only works without overloaded functions, of course).

apply.hpp

#include <utility>

template<class Func, class... Args>
auto apply(Func fn, Args&&... args) {
    return [&](auto&&... sargs) { 
        return fn
            ( std::forward<decltype(args)>(args)...
            , std::forward<decltype(sargs)>(sargs)... ); 
    };
}