combine

Header

#include <fit/combine.hpp>

Description

The combine function adaptor combines several functions together with their arguments. It essentially zips each function with an argument before calling the main function.

Synopsis

template<class F, class... Gs>
constexpr combine_adaptor<F, Gs...> combine(F f, Gs... gs);

Semantics

assert(combine(f, gs...)(xs...) == f(gs(xs)...));

Requirements

F and Gs must be:

• ConstCallable
• MoveConstructible

Example

#include <fit.hpp>
#include <cassert>
#include <tuple>
#include <utility>

int main() {
    auto f = fit::combine(
        fit::construct<std::tuple>(),
        fit::capture(1)(fit::construct<std::pair>()),
        fit::capture(2)(fit::construct<std::pair>()));
    assert(f(3, 7) == std::make_tuple(std::make_pair(1, 3), std::make_pair(2, 7)));
}