topical media & game development
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lib-of-vs-libs-Poco-include-Poco-MetaProgramming.h / h



  //
  // TypeChecks.h
  //
  // Id: //poco/1.3/Foundation/include/Poco/MetaProgramming.h#1 
  //
  // Library: Foundation
  // Package: Core
  // Module:  MetaProgramming
  //
  // Common definitions useful for Meta Template Programming
  //
  // Copyright (c) 2006, Applied Informatics Software Engineering GmbH.
  // and Contributors.
  //
  // Permission is hereby granted, free of charge, to any person or organization
  // obtaining a copy of the software and accompanying documentation covered by
  // this license (the "Software") to use, reproduce, display, distribute,
  // execute, and transmit the Software, and to prepare derivative works of the
  // Software, and to permit third-parties to whom the Software is furnished to
  // do so, all subject to the following:
  // 
  // The copyright notices in the Software and this entire statement, including
  // the above license grant, this restriction and the following disclaimer,
  // must be included in all copies of the Software, in whole or in part, and
  // all derivative works of the Software, unless such copies or derivative
  // works are solely in the form of machine-executable object code generated by
  // a source language processor.
  // 
  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  // FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
  // SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
  // FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
  // ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  // DEALINGS IN THE SOFTWARE.
  //
  
  ifndef  Foundation_TypeChecks_INCLUDED
  define  Foundation_TypeChecks_INCLUDED
  
  include "Poco/Foundation.h"
  
  namespace Poco {
  
  template <typename T>
  struct IsReference
Use this struct to determine if a template type is a reference { enum { VALUE = 0 }; }; 

  template <typename T>
  struct IsReference<T&>
  {
          enum 
          {
                  VALUE = 1
          };
  };
  
  template <typename T>
  struct IsReference<const T&>
  {
          enum 
          {
                  VALUE = 1
          };
  };
  
  template <typename T>
  struct IsConst
Use this struct to determine if a template type is a const type { enum { VALUE = 0 }; }; 

  template <typename T>
  struct IsConst<const T&>
  {
          enum 
          {
                  VALUE = 1
          };
  };
  
  template <typename T>
  struct IsConst<const T>
  {
          enum 
          {
                  VALUE = 1
          };
  };
  
  template <typename T>
  struct TypeWrapper
Use the type wrapper if you want to dedecouple constness and references from template types { typedef T TYPE; typedef const T CONSTTYPE; typedef T& REFTYPE; typedef const T& CONSTREFTYPE; }; 

  template <typename T>
  struct TypeWrapper<const T>
  {
          typedef T TYPE;
          typedef const T CONSTTYPE;
          typedef T& REFTYPE;
          typedef const T& CONSTREFTYPE;
  };
  
  template <typename T>
  struct TypeWrapper<const T&>
  {
          typedef T TYPE;
          typedef const T CONSTTYPE;
          typedef T& REFTYPE;
          typedef const T& CONSTREFTYPE;
  };
  
  template <typename T>
  struct TypeWrapper<T&>
  {
          typedef T TYPE;
          typedef const T CONSTTYPE;
          typedef T& REFTYPE;
          typedef const T& CONSTREFTYPE;
  };
  
  } // namespace Poco
  
  endif
[] readme course(s) preface I 1 2 II 3 4 III 5 6 7 IV 8 9 10 V 11 12 afterthought(s) appendix reference(s) example(s) resource(s) _

(C) Æliens 04/09/2009

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