terse.cpp

//
// Copyright (c) 2019-2020 Kris Jusiak (kris at jusiak dot net)
//
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//
#include <boost/ut.hpp>

constexpr auto sum = [](auto... args) { return (0 + ... + args); };

struct foo {
  int a{};
  bool b{};

  constexpr auto operator==(const foo& other) const {
    return a == other.a and b == other.b;
  }

  constexpr auto operator!=(const foo& other) const {
    return not(*this == other);
  }

  friend auto& operator<<(std::ostream& os, const foo& f) {
    return (os << "foo{" << f.a << ',' << f.b << '}');
  }
};

int main() {
  using boost::ut::operator""_test;
  using namespace boost::ut::literals;
  using namespace boost::ut::operators::terse;

  "terse"_test = [] {
    6_i == sum(1, 2, 3);
    sum(1, 1) == 2_i;
    (42_i == sum(40, 2)) and (0_i != sum(1) or 4_i == 3);
  };

  // clang-format off
  "terse type"_test = [] {
    foo{.a = 42, .b = true}%_t == foo{42, true};
    foo{.a = 43, .b = true} != foo{42, true}%_t;

    constexpr auto make_foo = [](auto... args) { return foo{args...}; };
    foo{42, true} == make_foo(42, true)%_t;
  };
  // clang-format on
}