utility_eastl.h

/*
Copyright (C) 2005,2009-2010 Electronic Arts, Inc.  All rights reserved.

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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.  Neither the name of Electronic Arts, Inc. ("EA") nor the names of
    its contributors may be used to endorse or promote products derived
    from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY ELECTRONIC ARTS AND ITS CONTRIBUTORS "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 ELECTRONIC ARTS OR ITS CONTRIBUTORS BE LIABLE FOR ANY
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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*/

// EASTL/utility.h
// Written and maintained by Paul Pedriana - 2005.



#ifndef EASTL_UTILITY_H
#define EASTL_UTILITY_H


#include <stk_util/util/config_eastl.h>


#ifdef _MSC_VER
    #pragma warning(push)           // VC++ generates a bogus warning that you cannot code away.
    #pragma warning(disable: 4619)  // There is no warning number 'number'.
    #pragma warning(disable: 4217)  // Member template functions cannot be used for copy-assignment or copy-construction.
    #pragma warning(disable: 4512)  // 'class' : assignment operator could not be generated.  // This disabling would best be put elsewhere.
#endif


namespace eastl
{

    namespace rel_ops
    {
        template <typename T>
        inline bool operator!=(const T& x, const T& y)
            { return !(x == y); }

        template <typename T>
        inline bool operator>(const T& x, const T& y)
            { return (y < x); }

        template <typename T>
        inline bool operator<=(const T& x, const T& y)
            { return !(y < x); }

        template <typename T>
        inline bool operator>=(const T& x, const T& y)
            { return !(x < y); }
    }



    template <typename T1, typename T2>
    struct pair
    {
        typedef T1 first_type;
        typedef T2 second_type;

        T1 first;
        T2 second;

        pair();
        pair(const T1& x);
        pair(const T1& x, const T2& y);

        template <typename U, typename V>
        pair(const pair<U, V>& p);

        // pair(const pair& p);              // Not necessary, as default version is OK.
        // pair& operator=(const pair& p);   // Not necessary, as default version is OK.
    };




    template <typename T>
    struct use_self             // : public unary_function<T, T> // Perhaps we want to make it a subclass of unary_function.
    {
        typedef T result_type;

        const T& operator()(const T& x) const
            { return x; }
    };

    template <typename Pair>
    struct use_first            // : public unary_function<Pair, typename Pair::first_type> // Perhaps we want to make it a subclass of unary_function.
    {
        typedef typename Pair::first_type result_type;

        const result_type& operator()(const Pair& x) const
            { return x.first; }
    };

    template <typename Pair>
    struct use_second           // : public unary_function<Pair, typename Pair::second_type> // Perhaps we want to make it a subclass of unary_function.
    {
        typedef typename Pair::second_type result_type;

        const result_type& operator()(const Pair& x) const
            { return x.second; }
    };





    // pair

    template <typename T1, typename T2>
    inline pair<T1, T2>::pair()
        : first(), second()
    {
        // Empty
    }


    template <typename T1, typename T2>
    inline pair<T1, T2>::pair(const T1& x)
        : first(x), second()
    {
        // Empty
    }


    template <typename T1, typename T2>
    inline pair<T1, T2>::pair(const T1& x, const T2& y)
        : first(x), second(y)
    {
        // Empty
    }


    template <typename T1, typename T2>
    template <typename U, typename V>
    inline pair<T1, T2>::pair(const pair<U, V>& p)
        : first(p.first), second(p.second)
    {
        // Empty
    }




    // global operators

    template <typename T1, typename T2>
    inline bool operator==(const pair<T1, T2>& a, const pair<T1, T2>& b)
    {
        return ((a.first == b.first) && (a.second == b.second));
    }


    template <typename T1, typename T2>
    inline bool operator<(const pair<T1, T2>& a, const pair<T1, T2>& b)
    {
        // Note that we use only operator < in this expression. Otherwise we could
        // use the simpler: return (a.m1 == b.m1) ? (a.m2 < b.m2) : (a.m1 < b.m1);
        // The user can write a specialization for this operator to get around this
        // in cases where the highest performance is required.
        return ((a.first < b.first) || (!(b.first < a.first) && (a.second < b.second)));
    }


    template <typename T1, typename T2>
    inline bool operator!=(const pair<T1, T2>& a, const pair<T1, T2>& b)
    {
        return !(a == b);
    }


    template <typename T1, typename T2>
    inline bool operator>(const pair<T1, T2>& a, const pair<T1, T2>& b)
    {
        return b < a;
    }


    template <typename T1, typename T2>
    inline bool operator>=(const pair<T1, T2>& a, const pair<T1, T2>& b)
    {
        return !(a < b);
    }


    template <typename T1, typename T2>
    inline bool operator<=(const pair<T1, T2>& a, const pair<T1, T2>& b)
    {
        return !(b < a);
    }




    template <typename T1, typename T2>
    inline pair<T1, T2> make_pair(T1 a, T2 b)
    {
        return pair<T1, T2>(a, b);
    }


    template <typename T1, typename T2>
    inline pair<T1, T2> make_pair_ref(const T1& a, const T2& b)
    {
        return pair<T1, T2>(a, b);
    }


} // namespace eastl


#ifdef _MSC_VER
    #pragma warning(pop)
#endif


#endif // Header include guard