pg_fix.h

/*
    Copyright (c) 2007-2009 Takashi Kitao
    All rights reserved.

    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions
    are met:

    1. Redistributions of source code must retain the above copyright
    `  notice, this list of conditions and the following disclaimer.

    2. Redistributions in binary form must reproduce the above copyright
    `  notice, this list of conditions and the following disclaimer in the
    `  documentation and/or other materials provided with the distribution.

    3. The name of the author may not be used to endorse or promote products
    `  derived from this software without specific prior written permission.

    THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
    IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
    OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
    IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
    INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
    NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
    DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
    THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/


class PG_API pgFix
{
public:
    pgDefineException(ExceptionOverflow);
    pgDefineException(ExceptionUnderflow);

    pgFix();

    pgFix(s32 n);

    pgFix(r32 r);

    bool operator==(pgFix fix) const;

    bool operator!=(pgFix fix) const;

    bool operator<(pgFix fix) const;

    bool operator>(pgFix fix) const;

    bool operator<=(pgFix fix) const;

    bool operator>=(pgFix fix) const;

    pgFix operator+(pgFix fix) const;

    PG_API friend pgFix operator+(s32 n, pgFix fix);

    PG_API friend pgFix operator+(r32 r, pgFix fix);

    void operator+=(pgFix fix);

    pgFix operator-() const;

    pgFix operator-(pgFix fix) const;

    PG_API friend pgFix operator-(s32 n, pgFix fix);

    PG_API friend pgFix operator-(r32 r, pgFix fix);

    void operator-=(pgFix fix);

    pgFix operator*(pgFix fix) const;

    PG_API friend pgFix operator*(s32 n, pgFix fix);

    PG_API friend pgFix operator*(r32 r, pgFix fix);

    void operator*=(pgFix fix);

    pgFix operator/(pgFix fix) const;

    PG_API friend pgFix operator/(s32 n, pgFix fix);

    PG_API friend pgFix operator/(r32 r, pgFix fix);

    void operator/=(pgFix fix);

    s32 toS32() const;

    r32 toR32() const;

    s32 getValue() const;

    static pgFix fromValue(s32 value);

private:
    static const u32 BIT_NUM = 32;
    static const u32 FRACTION_BIT_NUM = 16;

    static void checkOverflow(s64 value);

    s32 m_value;
};

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