include/functional

/* -*- c++ -*- */
/*
 * Copyright (C) 2009 The Android Open Source Project
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *  * Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE
 * COPYRIGHT OWNER OR CONTRIBUTORS 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.
 */

#ifndef ANDROID_ASTL_FUNCTIONAL__
#define ANDROID_ASTL_FUNCTIONAL__

#if defined(_T) || defined(_Arg) || defined(_Arg1) || defined(_Arg2) || \
    defined(_Result) || defined(_Name) || defined(_Op)
#error "Macro(s) already defined."
#endif

namespace std {

template <class _Arg, class _Result>
struct unary_function {
    typedef _Arg    argument_type;
    typedef _Result result_type;
};

template <class _Arg1, class _Arg2, class _Result>
struct binary_function {
    typedef _Arg1   first_argument_type;
    typedef _Arg2   second_argument_type;
    typedef _Result result_type;
};

// Comparaison

#define FUNCTIONAL_BINARY_COMPARAISON(_Name, _Op)              \
    template <typename _T>                                     \
    struct _Name : public binary_function<_T, _T, bool>        \
    {                                                          \
        bool operator()(const _T& left, const _T& right) const \
        { return left _Op right; }                             \
    };

FUNCTIONAL_BINARY_COMPARAISON(equal_to, ==)
FUNCTIONAL_BINARY_COMPARAISON(not_equal_to, !=)
FUNCTIONAL_BINARY_COMPARAISON(greater, >)
FUNCTIONAL_BINARY_COMPARAISON(less, <)
FUNCTIONAL_BINARY_COMPARAISON(greater_equal, >=)
FUNCTIONAL_BINARY_COMPARAISON(less_equal, <=)

}  // namespace std

#endif  // ANDROID_ASTL_FUNCTIONAL__