convenience.hpp

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/************************************************************
 * convenience.hpp                                             *
 *                                                          *
 *  Created on: 1 Mar 2014                                     *
 *      Author: Leonidas Georgopoulos                                     *
 *
 *  Copyright (C) 2014 Leonidas Georgopoulos
 *  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)
 *
 ************************************************************/
 
#ifndef LUTILS_CONVENIENCE_HPP_
#define LUTILS_CONVENIENCE_HPP_
 
/*
 * STL inclusions
 */
#include <memory>
#include <string>
#include <typeinfo>
 
/*
 * G++ demangle
 */
#ifdef __GNUG__
#include <cstdlib>
#include <cxxabi.h>
#endif
 
namespace tools
{
//------------------------------------------------------------------------------
template<typename T> class gentraits
{
public:
    typedef std::string t_is;
 
    static t_is constexpr isnot();
 
    static t_is constexpr isa();
 
#ifdef __GNUG__
    static t_is constexpr filt();
#endif
};
//------------------------------------------------------------------------------
 
//------------------------------------------------------------------------------
template<typename T> typename gentraits<T>::t_is constexpr filt(T *)
{
    return gentraits<T>::filt();
}
//------------------------------------------------------------------------------
 
//------------------------------------------------------------------------------
template<typename T> typename gentraits<T>::t_is constexpr gentraits<T>::isnot()
{
    return t_is("ISNOT");
}
//------------------------------------------------------------------------------
 
//------------------------------------------------------------------------------
template<typename T> typename gentraits<T>::t_is constexpr gentraits<T>::isa()
{
    return typeid(T).name();
}
//------------------------------------------------------------------------------
 
//------------------------------------------------------------------------------
#ifdef __GNUG__
template<typename T> typename gentraits<T>::t_is constexpr gentraits<T>::filt()
{
    int status = -42;
    char *res = abi::__cxa_demangle(typeid(T).name(), NULL, NULL, &status);
 
    if(status != 0) {
        ::free(res);
        return isnot();
    } else {
        typename gentraits<T>::t_is result =  res;
        ::free(res);
        return result;
    }
}
#endif
//------------------------------------------------------------------------------
 
//------------------------------------------------------------------------------
template<typename A, typename B> typename gentraits<A>::t_is const isa(
        B const &)
{
    return typeid(A).name() == typeid(B).name() ? typeid(A).name() :
            gentraits<A>::isnot();
}
//------------------------------------------------------------------------------
 
}/* namespace tools */
 
#endif