lemon/concept_check.h
author Alpar Juttner <alpar@cs.elte.hu>
Thu, 04 Aug 2011 22:00:57 +0200
changeset 924 3dcb45a871c3
parent 280 e7f8647ce760
child 440 88ed40ad0d4f
permissions -rw-r--r--
Update the AUTHORS file
     1 /* -*- mode: C++; indent-tabs-mode: nil; -*-
     2  *
     3  * This file is a part of LEMON, a generic C++ optimization library.
     4  *
     5  * Copyright (C) 2003-2008
     6  * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
     7  * (Egervary Research Group on Combinatorial Optimization, EGRES).
     8  *
     9  * Permission to use, modify and distribute this software is granted
    10  * provided that this copyright notice appears in all copies. For
    11  * precise terms see the accompanying LICENSE file.
    12  *
    13  * This software is provided "AS IS" with no warranty of any kind,
    14  * express or implied, and with no claim as to its suitability for any
    15  * purpose.
    16  *
    17  */
    18 
    19 // The contents of this file was inspired by the concept checking
    20 // utility of the BOOST library (http://www.boost.org).
    21 
    22 ///\file
    23 ///\brief Basic utilities for concept checking.
    24 ///
    25 
    26 #ifndef LEMON_CONCEPT_CHECK_H
    27 #define LEMON_CONCEPT_CHECK_H
    28 
    29 namespace lemon {
    30 
    31   /*
    32     "inline" is used for ignore_unused_variable_warning()
    33     and function_requires() to make sure there is no
    34     overtarget with g++.
    35   */
    36 
    37   template <class T> inline void ignore_unused_variable_warning(const T&) { }
    38 
    39   ///\e
    40   template <class Concept>
    41   inline void function_requires()
    42   {
    43 #if !defined(NDEBUG)
    44     void (Concept::*x)() = & Concept::constraints;
    45     ignore_unused_variable_warning(x);
    46 #endif
    47   }
    48 
    49   ///\e
    50   template <typename Concept, typename Type>
    51   inline void checkConcept() {
    52 #if !defined(NDEBUG)
    53     typedef typename Concept::template Constraints<Type> ConceptCheck;
    54     void (ConceptCheck::*x)() = & ConceptCheck::constraints;
    55     ignore_unused_variable_warning(x);
    56 #endif
    57   }
    58 
    59 } // namespace lemon
    60 
    61 #endif // LEMON_CONCEPT_CHECK_H