xtd::subtractable< type_t > Struct Template Reference

Definition

template<typename type_t>
struct xtd::subtractable< type_t >

Concept subtractable.

Definition

template<typename type_t>
concept xtd::subtractable = requires(const xtd::raw_type<type_t>& a, const xtd::raw_type<type_t>& b) {{a - b} -> std::same_as<xtd::raw_type<type_t>>;};

Header

#include <xtd/subtractable>

Namespace

xtd

Library

xtd.core

Examples

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

#include <xtd/xtd>
 
auto print_is_subtractable(auto value) noexcept {
  println("{} ({}) {} subtractable", value, type_of(value), subtractable<decltype(value)> ? "is" : "is not");
}
 
auto main() -> int {
  print_is_subtractable(42);
  print_is_subtractable(time_span {1, 2, 3});
  print_is_subtractable(version {1, 2, 3});
}
 
// This code produces the following output :
//
// 42 (int) is subtractable
// 01:02:03 (xtd::time_span) is subtractable
// 1.2.3 (xtd::version) is not subtractable

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

• xtd.core/include/xtd/subtractable_.hpp