DYT/Tool/OpenSceneGraph-3.6.5/include/OpenEXR/ImfRational.h

//
// SPDX-License-Identifier: BSD-3-Clause
// Copyright (c) Contributors to the OpenEXR Project.
//

#ifndef INCLUDED_IMF_RATIONAL_H
#define INCLUDED_IMF_RATIONAL_H

#include "ImfExport.h"
#include "ImfNamespace.h"

//-----------------------------------------------------------------------------
//
//	Rational numbers
//
//	A rational number is represented as pair of integers, n and d.
//	The value of of the rational number is
//
//		n/d			for d > 0
//		positive infinity	for n > 0, d == 0
//		negative infinity	for n < 0, d == 0
//		not a number (NaN)	for n == 0, d == 0
//
//-----------------------------------------------------------------------------

OPENEXR_IMF_INTERNAL_NAMESPACE_HEADER_ENTER

class IMF_EXPORT_TYPE Rational
{
public:
    int          n; // numerator
    unsigned int d; // denominator

    //----------------------------------------
    // Default constructor, sets value to zero
    //----------------------------------------

    Rational () : n (0), d (1) {}

    //-------------------------------------
    // Constructor, explicitly sets n and d
    //-------------------------------------

    Rational (int n, int d) : n (n), d (d) {}

    //----------------------------
    // Constructor, approximates x
    //----------------------------

    IMF_EXPORT
    explicit Rational (double x);

    //---------------------------------
    // Approximate conversion to double
    //---------------------------------

    operator double () const { return double (n) / double (d); }
};

OPENEXR_IMF_INTERNAL_NAMESPACE_HEADER_EXIT

#endif