Class assert_no_strong_except_guarantee

include/function2/function2.hpp:1482–1491

template <bool IsStrongExceptGuaranteed, typename T>
struct assert_no_strong_except_guarantee {
  static_assert(
      !IsStrongExceptGuaranteed ||
          (std::is_nothrow_move_constructible<T>::value &&
           std::is_nothrow_destructible<T>::value),
      "Can't wrap a object an object that has no strong exception guarantees "
      "if this is required by the wrapper!");

  using type = void;
};

/// SFINAES out if the given callable is not copyable correct to the left one.
template <typename LeftConfig, typename RightConfig>