TestUtilities.hpp

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//                Copyright Oliver J. Rosten 2018.                //
// Distributed under the GNU GENERAL PUBLIC LICENSE, Version 3.0. //
//    (See accompanying file LICENSE.md or copy at                //
//          https://www.gnu.org/licenses/gpl-3.0.en.html)         //
 
#pragma once
 
namespace sequoia::testing
{
  class no_default_constructor
  {
  public:
    constexpr explicit no_default_constructor(int i) : m_i{i} {}
 
    [[nodiscard]]
    constexpr int get() const noexcept { return m_i; }
 
    [[nodiscard]]
    constexpr friend bool operator==(const no_default_constructor&, const no_default_constructor&) noexcept = default;
  private:
    int m_i{};
  };
}
 
namespace std {
  template<>
  struct formatter<sequoia::testing::no_default_constructor>
  {
    constexpr auto parse(auto& ctx) { return ctx.begin(); }
 
    auto format(const sequoia::testing::no_default_constructor& ndc, auto& ctx) const
    {
      return std::format_to(ctx.out(), "{}", ndc.get());
    }
  };
}