mirror of
https://github.com/matrix-construct/construct
synced 2024-06-26 05:48:20 +02:00
67 lines
1.7 KiB
C++
67 lines
1.7 KiB
C++
// Matrix Construct
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//
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// Copyright (C) Matrix Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2018 Jason Volk <jason@zemos.net>
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice is present in all copies. The
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// full license for this software is available in the LICENSE file.
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#pragma once
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#define HAVE_IRCD_UTIL_POINTERS_H
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//
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// Transform to pointer utils
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//
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namespace ircd {
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inline namespace util {
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/// Transform input sequence values to pointers in the output sequence
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/// using two input iterators [begin, end] and one output iterator [begin]
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template<class input_begin,
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class input_end,
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class output_begin>
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auto
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pointers(input_begin&& ib,
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const input_end &ie,
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output_begin&& ob)
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{
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return std::transform(ib, ie, ob, []
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(auto&& value)
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{
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return std::addressof(value);
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});
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}
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/// Transform input sequence values to pointers in the output sequence
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/// using two input iterators [begin, end] and one output iterator [begin]
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template<class input_begin,
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class input_end,
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class output_begin,
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class output_end>
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auto
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pointers(input_begin&& ib,
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const input_end &ie,
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output_begin&& ob,
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const output_end &oe)
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{
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for(; ib != ie && ob != oe; ++ib, ++ob)
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*ob = std::addressof(*ib);
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return ob;
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}
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template<class input_container,
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class output_container>
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auto
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pointers(input_container&& ic,
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output_container &oc)
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{
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return pointers(begin(ic), end(ic), begin(oc), end(oc));
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}
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} // namespace util
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} // namespace ircd
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