75 lines
2.4 KiB
C++
75 lines
2.4 KiB
C++
|
// -- select_functions.hpp -- Boost Lambda Library --------------------------
|
||
|
|
|
||
|
|
// Copyright (C) 1999, 2000 Jaakko Jarvi (jaakko.jarvi@cs.utu.fi)
|
||
|
|
//
|
||
|
|
// 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)
|
||
|
|
//
|
||
|
|
// For more information, see http://www.boost.org
|
||
|
|
|
||
|
|
|
||
|
|
#ifndef BOOST_LAMBDA_SELECT_FUNCTIONS_HPP
|
||
|
|
#define BOOST_LAMBDA_SELECT_FUNCTIONS_HPP
|
||
|
|
|
||
|
|
namespace boost {
|
||
|
|
namespace lambda {
|
||
|
|
namespace detail {
|
||
|
|
|
||
|
|
|
||
|
|
// select functions -------------------------------
|
||
|
|
template<class Any, CALL_TEMPLATE_ARGS>
|
||
|
|
inline Any& select(Any& any, CALL_FORMAL_ARGS) { CALL_USE_ARGS; return any; }
|
||
|
|
|
||
|
|
|
||
|
|
template<class Arg, CALL_TEMPLATE_ARGS>
|
||
|
|
inline typename Arg::template sig<tuple<CALL_REFERENCE_TYPES> >::type
|
||
|
|
select ( const lambda_functor<Arg>& op, CALL_FORMAL_ARGS ) {
|
||
|
|
return op.template call<
|
||
|
|
typename Arg::template sig<tuple<CALL_REFERENCE_TYPES> >::type
|
||
|
|
>(CALL_ACTUAL_ARGS);
|
||
|
|
}
|
||
|
|
template<class Arg, CALL_TEMPLATE_ARGS>
|
||
|
|
inline typename Arg::template sig<tuple<CALL_REFERENCE_TYPES> >::type
|
||
|
|
select ( lambda_functor<Arg>& op, CALL_FORMAL_ARGS) {
|
||
|
|
return op.template call<
|
||
|
|
typename Arg::template sig<tuple<CALL_REFERENCE_TYPES> >::type
|
||
|
|
>(CALL_ACTUAL_ARGS);
|
||
|
|
}
|
||
|
|
|
||
|
|
// ------------------------------------------------------------------------
|
||
|
|
// select functions where the return type is explicitly given
|
||
|
|
// Note: on many functions, this return type is just discarded.
|
||
|
|
// The select functions are inside a class template, and the return type
|
||
|
|
// is a class template argument.
|
||
|
|
// The first implementation used function templates with an explicitly
|
||
|
|
// specified template parameter.
|
||
|
|
// However, this resulted in ambiguous calls (at least with gcc 2.95.2
|
||
|
|
// and edg 2.44). Not sure whether the compilers were right or wrong.
|
||
|
|
|
||
|
|
template<class RET> struct r_select {
|
||
|
|
|
||
|
|
// Any == RET
|
||
|
|
template<class Any, CALL_TEMPLATE_ARGS>
|
||
|
|
static
|
||
|
|
inline RET go (Any& any, CALL_FORMAL_ARGS) { CALL_USE_ARGS; return any; }
|
||
|
|
|
||
|
|
|
||
|
|
template<class Arg, CALL_TEMPLATE_ARGS>
|
||
|
|
static
|
||
|
|
inline RET go (const lambda_functor<Arg>& op, CALL_FORMAL_ARGS ) {
|
||
|
|
return op.template call<RET>(CALL_ACTUAL_ARGS);
|
||
|
|
}
|
||
|
|
template<class Arg, CALL_TEMPLATE_ARGS>
|
||
|
|
static
|
||
|
|
inline RET go (lambda_functor<Arg>& op, CALL_FORMAL_ARGS ) {
|
||
|
|
return op.template call<RET>(CALL_ACTUAL_ARGS);
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
} // namespace detail
|
||
|
|
} // namespace lambda
|
||
|
|
} // namespace boost
|
||
|
|
|
||
|
|
#endif
|