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       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) 2003-2009
       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                 :        102 :   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                 :        102 :   inline void checkConcept() {
      52                 :            : #if !defined(NDEBUG)
      53                 :            :     typedef typename Concept::template Constraints<Type> ConceptCheck;
      54                 :        102 :     void (ConceptCheck::*x)() = & ConceptCheck::constraints;
      55 [ #  # ][ #  # ]:        102 :     ignore_unused_variable_warning(x);
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      56                 :            : #endif
      57                 :        102 :   }
      58                 :            : 
      59                 :            : } // namespace lemon
      60                 :            : 
      61                 :            : #endif // LEMON_CONCEPT_CHECK_H