// matrix/matrix-common.h

// Copyright 2009-2011  Microsoft Corporation

// See ../../COPYING for clarification regarding multiple authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at

//  http://www.apache.org/licenses/LICENSE-2.0

// THIS CODE IS PROVIDED *AS IS* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED
// WARRANTIES OR CONDITIONS OF TITLE, FITNESS FOR A PARTICULAR PURPOSE,
// MERCHANTABLITY OR NON-INFRINGEMENT.
// See the Apache 2 License for the specific language governing permissions and
// limitations under the License.
#ifndef KALDI_MATRIX_MATRIX_COMMON_H_
#define KALDI_MATRIX_MATRIX_COMMON_H_

// This file contains some #includes, forward declarations
// and typedefs that are needed by all the main header
// files in this directory.

#include "base/kaldi-common.h"

namespace kaldi {
// this enums equal to CblasTrans and CblasNoTrans constants from CBLAS library
// we are writing them as literals because we don't want to include here
// matrix/kaldi-blas.h,
// which puts many symbols into global scope (like "real") via the header f2c.h
typedef enum {
    kTrans = 112,   // = CblasTrans
    kNoTrans = 111  // = CblasNoTrans
} MatrixTransposeType;

typedef enum { kSetZero, kUndefined, kCopyData } MatrixResizeType;


typedef enum {
    kDefaultStride,
    kStrideEqualNumCols,
} MatrixStrideType;

typedef enum {
    kTakeLower,
    kTakeUpper,
    kTakeMean,
    kTakeMeanAndCheck
} SpCopyType;

template <typename Real>
class VectorBase;
template <typename Real>
class Vector;
template <typename Real>
class SubVector;
template <typename Real>
class MatrixBase;
template <typename Real>
class SubMatrix;
template <typename Real>
class Matrix;


/// This class provides a way for switching between double and float types.
template <typename T>
class OtherReal {};  // useful in reading+writing routines
                     // to switch double and float.
/// A specialized class for switching from float to double.
template <>
class OtherReal<float> {
  public:
    typedef double Real;
};
/// A specialized class for switching from double to float.
template <>
class OtherReal<double> {
  public:
    typedef float Real;
};


typedef int32 MatrixIndexT;
typedef int32 SignedMatrixIndexT;
typedef uint32 UnsignedMatrixIndexT;

// If you want to use size_t for the index type, do as follows instead:
// typedef size_t MatrixIndexT;
// typedef ssize_t SignedMatrixIndexT;
// typedef size_t UnsignedMatrixIndexT;
}  // namespace kaldi


#endif  // KALDI_MATRIX_MATRIX_COMMON_H_