Tsqr_ApplyType.cpp

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// ***********************************************************************
//
//                 Anasazi: Block Eigensolvers Package
//                 Copyright (2010) Sandia Corporation
//
// Under terms of Contract DE-AC04-94AL85000, there is a non-exclusive
// license for use of this work by or on behalf of the U.S. Government.
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// This library is free software; you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as
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// This library is distributed in the hope that it will be useful, but
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Lesser General Public License for more details.
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// You should have received a copy of the GNU Lesser General Public
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#include <Tsqr_ApplyType.hpp>
#include <stdexcept>


namespace TSQR {
  ApplyType::ApplyType (const std::string& op) :
    type_ (decide_apply_type (op)),
    lapackString_ (enumToLapackString (type_))
  {}

  ApplyType::ApplyType (const ApplyType& rhs) :
    type_ (rhs.type_),
    lapackString_ (rhs.lapackString_)
  {}

  ApplyType& ApplyType::operator= (const ApplyType& rhs) {
    type_ = rhs.type_;
    lapackString_ = rhs.lapackString_;
    return *this;
  }

  const ApplyType ApplyType::NoTranspose = ApplyType ("N");
  const ApplyType ApplyType::Transpose = ApplyType ("T");
  const ApplyType ApplyType::ConjugateTranspose = ApplyType ("C");

  std::string 
  ApplyType::enumToLapackString (const ApplyType::ApplyType_ theType)
  {
    if (theType == NoTranspose_)
      return std::string("N");
    else if (theType == Transpose_)
      return std::string("T");
    else if (theType == ConjugateTranspose_)
      return std::string("C");
    else
      throw std::logic_error("Invalid ApplyType: should never get here");
  }

  bool 
  ApplyType::decide_transposed (const std::string& op) const 
  {
    if (op[0] == 'N' || op[0] == 'n')
      return false;
    else
      {
  const char validTransposeLetters[] = "TtCcHh";
  const int numValidTransposeLetters = 6;

  for (int k = 0; k < numValidTransposeLetters; ++k)
    if (op[0] == validTransposeLetters[k])
      return true;

  throw std::invalid_argument ("Invalid \"op\" argument \"" + op + "\"");
      }
  }

  ApplyType::ApplyType_
  ApplyType::decide_apply_type (const std::string& op) const 
  {
    if (op[0] == 'T' || op[0] == 't')
      return Transpose_;
    else if (op[0] == 'N' || op[0] == 'n')
      return NoTranspose_;
    else if (op[0] == 'C' || op[0] == 'c' || op[0] == 'H' || op[0] == 'h')
      return ConjugateTranspose_;
    else
      throw std::invalid_argument ("Invalid \"op\" argument \"" + op + "\"");
  }
}