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// @HEADER
//
// ***********************************************************************
//
//           Amesos2: Templated Direct Sparse Solver Package 
//                  Copyright 2011 Sandia Corporation
//
// Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
// the U.S. Government retains certain rights in this software.
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// modification, are permitted provided that the following conditions are
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// notice, this list of conditions and the following disclaimer.
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// 2. Redistributions in binary form must reproduce the above copyright
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// documentation and/or other materials provided with the distribution.
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// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
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/**
 * \file   Amesos2_ctassert.hpp
 * \author Eric Bavier <etbavie@sandia.gov>
 * \date   Tue Jul 26 15:31:53 2011
 * 
 * \brief  Simple compile-time assertion class
 */

/* ETB: I think the Teuchos CompileTimeAssert class is backwards
 * (i.e. if the test evaluates to true, a compile-time error is
 * thrown), so I'm defining my own.
 *
 * This definition is based off a Dr Dobb's article on compile-time
 * assertions.
 */

#ifndef AMESOS2_CTASSERT_HPP
#define AMESOS2_CTASSERT_HPP

namespace Amesos2{
  
  template <bool assertion>
  struct ctassert {
    enum { N = 1 - 2*int(!assertion) };
    //  1 if assertion is true
    // -1 if assertion is false
    static char A[N];
  };

  template <bool assertion>
  char ctassert<assertion>::A[N];

}

#endif	// AMESOS2_CTASSERT_HPP