MacrosTest.h

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// $Maintainer: Hannes Roest $
// $Authors: Philippe M. Groarke, Hannes Roest $
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// See https://philippegroarke.com/posts/2018/easy_defensive_programming/
// https://github.com/p-groarke/defensive_cpp
 
#pragma once
#include <type_traits>
 
namespace OpenMS
{
  // no constexpr lambdas in C++11, therefore we have to use functions
  namespace Test
  {
#if __GNUC__ < 5
    // older gcc, will not compile
    bool fulfills_rule_of_5() {return true;}
    bool fulfills_rule_of_6() {return true;}
    bool fulfills_fast_vector() {return true;}
#else
    template <class T>
    constexpr bool fulfills_rule_of_5()
    {
      static_assert(std::is_destructible<T>::value, "T : must be destructible");
      static_assert(std::is_copy_constructible<T>::value, "T : must be copy constructible");
      static_assert(std::is_move_constructible<T>::value, "T : must be move constructible");
      static_assert(std::is_copy_assignable<T>::value, "T : must be copy assignable");
      static_assert(std::is_move_assignable<T>::value, "T : must be move assignable");
 
      return std::is_destructible<T>::value &&
             std::is_copy_constructible<T>::value &&
             std::is_move_constructible<T>::value &&
             std::is_copy_assignable<T>::value &&
             std::is_move_assignable<T>::value;
    }
 
    template <class T>
    constexpr bool fulfills_rule_of_6()
    {
      static_assert(fulfills_rule_of_5<T>(), "T : must fulfill rule of 5");
      static_assert(std::is_default_constructible<T>::value, "T : must be default constructible");
 
      return fulfills_rule_of_5<T>() &&
             std::is_default_constructible<T>::value;
    }
 
    template <class T>
    constexpr bool fulfills_fast_vector()
    {
      static_assert( (std::is_trivially_copy_constructible<T>::value && std::is_trivially_destructible<T>::value) ||
                      std::is_nothrow_move_constructible<T>::value,
                      "T : doesn't fulfill fast vector (trivially copy constructible " \
                        "and trivially destructible, or nothrow move constructible)");
 
      return (std::is_trivially_copy_constructible<T>::value && std::is_trivially_destructible<T>::value) ||
              std::is_nothrow_move_constructible<T>::value;
    };
#endif // check for gcc < 5.0
 
  }
}