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71 lines
1.1 KiB
71 lines
1.1 KiB
#pragma once
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#include "gp/algorithm/tmp_manip.hpp"
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namespace gp{
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template<typename T>
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concept IsSubstractible = requires(T a, T b)
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{
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{a - b} -> std::integral;
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};
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template<typename it, bool Enable = IsSubstractible<it>>
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class nameless_range;
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template<typename it>
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class nameless_range<it, false>
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{
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it _begin;
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it _end;
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friend nameless_range<it, true>;
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public:
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using associated_iterator = it;
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nameless_range() = delete;
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template<typename othT>
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nameless_range(const nameless_range<othT>& oth)
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: _begin(oth._begin)
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, _end(oth._end)
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{}
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nameless_range(it sbegin, it send)
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: _begin(sbegin)
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, _end(send)
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{}
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it begin() const
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{
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return _begin;
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}
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it end() const
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{
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return _end;
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}
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};
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template<typename it>
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class nameless_range<it, true> : public nameless_range<it, false>
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{
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public:
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nameless_range() = delete;
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template<typename othT>
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nameless_range(const nameless_range<othT>& oth)
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: nameless_range<it,false>(oth._begin,oth._end)
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{}
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nameless_range(it sbegin, it send)
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: nameless_range<it,false>(sbegin, send)
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{}
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std::size_t size() const
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{
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return this->_end-this->_begin;
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}
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};
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}
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