UniversalReferences.hpp

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#ifndef _UNIVERSALREFERENCE_HPP
#define _UNIVERSALREFERENCE_HPP

/// \file UniversalReferences.hpp
///
/// \brief Defines convenient macro and types for Universal References
///
/// https://isocpp.org/blog/2012/11/universal-references-in-c11-scott-meyers

#include <metaprogramming/TypeTraits.hpp>

namespace SUNphi
{
  /// See http://ericniebler.com/2013/08/07/universal-references-and-the-copy-constructo/
#define UNIVERSAL_REFERENCE_CONSTRUCTOR_OF_WRAPPER_DISABLE(T,WRAPPER)
  typename=EnableIf<not isBaseOf<WRAPPER<T>,T>>

  /////////////////////////////////////////////////////////////////////

  /// Forward according to http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2009/n2951.html
  template <class T,
        class U,
        class=EnableIf<(isLvalue<T> ?
                isLvalue<U> :
                true) and
               std::is_convertible<RemRef<U>*,
                           RemRef<T>*>::value>>
  constexpr T&& forw(U&& u)     ///< Variable to forward
  {
    return static_cast<T&&>(u);
  }

  /////////////////////////////////////////////////////////////////

  /// Short name for decltype(auto)
#define DECLAUTO decltype(auto)
}

#endif