/usr/include/trilinos/Teuchos_getConst.hpp is in libtrilinos-teuchos-dev 12.10.1-3.
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// ***********************************************************************
//
// Teuchos: Common Tools Package
// Copyright (2004) Sandia Corporation
//
// Under terms of Contract DE-AC04-94AL85000, there is a non-exclusive
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// @HEADER
#ifndef TEUCHOS_GET_CONST_HPP
#define TEUCHOS_GET_CONST_HPP
#include "Teuchos_ConfigDefs.hpp"
namespace Teuchos {
/** \brief Return a constant reference to an object given a non-const reference.
* \tparam T The type (without const qualifier) to make const.
*
* This template function provides a shorthand for
* \verbatim const_cast<const T&>(t) \endverbatim
* as
* \verbatim getConst(t) \endverbatim
* This saves you the trouble of typing the name of the class,
* and also saves readers of your code from looking at the
* (possibly long) class name.
*
* Here is an example showing why you might want to use this function.
* \code
* // A class with a very long name.
* class MyVeryLongClassNameWhichIsIndeedQuiteLongIsItNot { ... };
*
* // A function which takes a const reference to an instance of that class.
* void f1 (const MyVeryLongClassNameWhichIsIndeedQuiteLongIsItNot& x)
*
* // A function which takes a nonconst reference to an instance of that class,
* // but needs to call f1, which takes a const reference.
* void f2 (MyVeryLongClassNameWhichIsIndeedQuiteLongIsItNot& x) {
* // ... do some stuff with x ...
* // Call f1. Notice how few characters this takes,
* // compared with a const_cast.
* f1 (getConst (x));
* // ... do other stuff ...
* }
* \endcode
*
* \ingroup teuchos_language_support_grp
*/
template<class T>
inline const T& getConst( T& t ) { return t; }
} // end namespace Teuchos
#endif // TEUCHOS_GET_CONST_HPP
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