qtutil.h

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/**********************************************************************
 * LeechCraft - modular cross-platform feature rich internet client.
 * Copyright (C) 2006-2014  Georg Rudoy
 *
 * Boost Software License - Version 1.0 - August 17th, 2003
 *
 * Permission is hereby granted, free of charge, to any person or organization
 * obtaining a copy of the software and accompanying documentation covered by
 * this license (the "Software") to use, reproduce, display, distribute,
 * execute, and transmit the Software, and to prepare derivative works of the
 * Software, and to permit third-parties to whom the Software is furnished to
 * do so, all subject to the following:
 *
 * The copyright notices in the Software and this entire statement, including
 * the above license grant, this restriction and the following disclaimer,
 * must be included in all copies of the Software, in whole or in part, and
 * all derivative works of the Software, unless such copies or derivative
 * works are solely in the form of machine-executable object code generated by
 * a source language processor.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
 * SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
 * FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 **********************************************************************/
 
#pragma once
 
#include "sllconfig.h"
 
namespace LC::Util
{
    namespace detail
    {
        template<template<typename, typename> class PairType, typename BaseIt, typename Key, typename Value>
        struct Iterator
        {
            using iterator_category = std::bidirectional_iterator_tag;
            using difference_type = std::ptrdiff_t;
 
            using value_type = PairType<Key, Value>;
            using reference = value_type;
            using pointer = value_type*;
 
            BaseIt BaseIt_;
 
            bool operator== (const Iterator& other) const { return BaseIt_ == other.BaseIt_; }
            bool operator!= (const Iterator& other) const { return BaseIt_ != other.BaseIt_; }
 
            reference operator* () { return { BaseIt_.key (), BaseIt_.value () }; }
 
            Iterator& operator++ ()
            {
                ++BaseIt_;
                return *this;
            }
 
            Iterator operator++ (int) & { return { BaseIt_++ }; }
 
            Iterator& operator-- ()
            {
                --BaseIt_;
                return *this;
            }
 
            Iterator operator-- (int) & { return { BaseIt_-- }; }
        };
 
        template<typename Iter, typename BaseIter, typename Assoc>
        struct Range
        {
            Assoc Assoc_;
 
            BaseIter Begin_ = Assoc_.begin ();
            BaseIter End_ = Assoc_.end ();
 
            auto begin () const { return Iter { Begin_ }; }
            auto end () const { return Iter { End_ }; }
        };
    }
 
    template<template<typename K, typename V> class PairType = std::pair, typename Assoc>
    auto Stlize (Assoc&& assoc)
    {
        using BaseIt = decltype (assoc.begin ());
        using Iterator = detail::Iterator<
                PairType,
                BaseIt,
                decltype (BaseIt {}.key ()),
                decltype (BaseIt {}.value ())
            >;
        return detail::Range<Iterator, BaseIt, Assoc> { std::forward<Assoc> (assoc) };
    }
 
    template<template<typename K, typename V> class PairType = std::pair, typename Assoc>
    auto StlizeCopy (Assoc&& assoc)
    {
        using BaseIt = decltype (assoc.begin ());
        using Iterator = detail::Iterator<
                PairType,
                BaseIt,
                std::decay_t<decltype (BaseIt {}.key ())>,
                std::decay_t<decltype (BaseIt {}.value ())>
            >;
        return detail::Range<Iterator, BaseIt, Assoc> { std::forward<Assoc> (assoc) };
    }
}