add_expression_with_own_struct.cpp

Shows how to use xtd::expressions::expression::add expression.

#include <xtd/xtd>
 
struct foo {
  int value;
  
  auto operator +(const foo& v) -> foo {return foo {value + v.value};}
};
 
auto main() -> int {
  //auto add = [](auto&& _1, auto&& _2) {return _1 + _2;}
  auto add = _1 + _2;
 
  println(R"(add(40, 20)) = {})", add(40, 20));
  println(R"(add("Barry "_s, "Allen"_s) = {})", add("Barry "_s, "Allen"_s));
  println(R"(add(date_time {2026, 4, 20, 21, 12, 36}, 7_min + 24_s) = {})", add(date_time {2026, 4, 20, 21, 12, 36}, 7_min + 24_s));
  println(R"(add(foo {{50}}, foo {{30}}) = {})", add(foo {50}, foo {30}).value);
  println();
}
 
// This code produces the following output :
//
// add(40, 20)) = 60
// add("Barry "_s, "Allen"_s) = Barry Allen
// add(date_time , 7_min + 24_s) = 4/20/2026 9:20:00 PM
// add(foo {50}, foo {30}) = 80