This file is indexed.

/usr/include/trilinos/ml_epetra.h is in libtrilinos-ml-dev 12.10.1-3.

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The actual contents of the file can be viewed below.

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/* ******************************************************************** */
/* See the file COPYRIGHT for a complete copyright notice, contact      */
/* person and disclaimer.                                               */
/* ******************************************************************** */
#ifndef ML_EPETRA_H
#define ML_EPETRA_H

// prints out an error message if variable is not zero,
// and return this value. This macro always returns.
#define ML_RETURN(ml_err) \
  { if (ml_err != 0) { \
    std::cerr << "ML::ERROR:: " << ml_err << ", " \
      << __FILE__ << ", line " << __LINE__ << std::endl; } \
      return(ml_err);  }

// prints out an error message if variable is not zero,
// and return this value.
#define ML_CHK_ERR(ml_err) \
  { if (ml_err != 0) { \
    std::cerr << "ML::ERROR:: " << ml_err << ", " \
      << __FILE__ << ", line " << __LINE__ << std::endl; \
      return(ml_err);  } }

// prints out an error message if variable is not zero
// and returns.
#define ML_CHK_ERRV(ml_err) \
  { if (ml_err != 0) { \
    std::cerr << "ML::ERROR:: " << ml_err << ", " \
      << __FILE__ << ", line " << __LINE__ << std::endl; \
    return; } }

#define ML_EXIT(ml_err) \
  { if (ml_err != 0) { \
    std::cerr << "ML::FATAL ERROR:: " << ml_err << ", " \
      << __FILE__ << ", line " << __LINE__ << std::endl; } \
    exit(ml_err); }

#endif