apply

Header

#include <boost/hof/apply.hpp>

Description

The apply function calls the function given to it with its arguments.

Synopsis

template<class F, class... Ts>
constexpr auto apply(F&& f, Ts&&... xs);

Semantics

assert(apply(f)(xs...) == f(xs...));
assert(fold(apply, f)(x, y, z) == f(x)(y)(z));

Requirements

F must be:

• Invocable

Example

#include <boost/hof.hpp>
#include <cassert>

struct sum_f
{
    template<class T, class U>
    T operator()(T x, U y) const
    {
        return x+y;
    }
};

int main() {
    assert(boost::hof::apply(sum_f(), 1, 2) == 3);
}