libs/utility/identity_type/test/abstract.cpp
// Copyright (C) 2009-2012 Lorenzo Caminiti
// Distributed under the Boost Software License, Version 1.0
// (see accompanying file LICENSE_1_0.txt or a copy at
// http://www.boost.org/LICENSE_1_0.txt)
// Home at http://www.boost.org/libs/utility/identity_type
#include <boost/utility/identity_type.hpp>
#include <boost/static_assert.hpp>
#include <boost/type_traits/add_reference.hpp>
#include <boost/type_traits/remove_reference.hpp>
//[abstract
#define TMP_ASSERT(metafunction) \
BOOST_STATIC_ASSERT(metafunction::value)
template<typename T, bool b>
struct abstract {
static const bool value = b;
virtual void f(T const& x) = 0; // Pure virtual function.
};
TMP_ASSERT(
boost::remove_reference< // Add and remove
BOOST_IDENTITY_TYPE(( // reference for
boost::add_reference< // abstract type.
abstract<int, true>
>::type
))
>::type
);
//]
int main() { return 0; }