xtd::invocable< function_t, result_t, args_t > Struct Template Reference

Definition

template<class function_t, class result_t = void, class... args_t>
struct xtd::invocable< function_t, result_t, args_t >

Represents the invocable (function, method, xtd::delegate, xtd::event, std::functional) concept.

Definition

template<class function_t, class result_t = void, class... args_t>
concept invocable = std::invocable<function_t, args_t...> && (std::is_void_v<result_t> || std::convertible_to<std::invoke_result_t<function_t, args_t...>, result_t>);

Header

#include <xtd/invocable>

Namespace

xtd

Library

xtd.core

Examples

The following code shows how to use xtd::invocable concept

#include <xtd/xtd>
 
template<class value_t>
auto sort_with(const array<value_t>& items, invocable<int, value_t, value_t> auto fct) -> array<value_t> {
  auto result = items;
  result.sort(fct);
  return result;
}
 
int main() {
  auto items = array {8.0, 2.0, 5.0, 9.0, 4.0, 1.0, 6.0, 7.0, 10.0, 3.0};
  println("items = {}", sort_with(items, [](auto a, auto b) {return a - b;}));
}
 
// This code produces the following output :
//
// items = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

---

The documentation for this struct was generated from the following file:

• xtd.core/include/xtd/invocable_.hpp