mirror of
https://github.com/matrix-construct/construct
synced 2024-11-09 11:31:11 +01:00
66 lines
1.7 KiB
C++
66 lines
1.7 KiB
C++
// Matrix Construct
|
|
//
|
|
// Copyright (C) Matrix Construct Developers, Authors & Contributors
|
|
// Copyright (C) 2016-2018 Jason Volk <jason@zemos.net>
|
|
//
|
|
// Permission to use, copy, modify, and/or distribute this software for any
|
|
// purpose with or without fee is hereby granted, provided that the above
|
|
// copyright notice and this permission notice is present in all copies. The
|
|
// full license for this software is available in the LICENSE file.
|
|
|
|
#pragma once
|
|
#define HAVE_IRCD_UTIL_POINTERS_H
|
|
|
|
//
|
|
// Transform to pointer utils
|
|
//
|
|
|
|
namespace ircd {
|
|
inline namespace util {
|
|
|
|
/// Transform input sequence values to pointers in the output sequence
|
|
/// using two input iterators [begin, end] and one output iterator [begin]
|
|
template<class input_begin,
|
|
class input_end,
|
|
class output_begin>
|
|
auto
|
|
pointers(input_begin&& ib,
|
|
const input_end &ie,
|
|
output_begin&& ob)
|
|
{
|
|
return std::transform(ib, ie, ob, []
|
|
(auto&& value)
|
|
{
|
|
return std::addressof(value);
|
|
});
|
|
}
|
|
|
|
/// Transform input sequence values to pointers in the output sequence
|
|
/// using two input iterators [begin, end] and one output iterator [begin]
|
|
template<class input_begin,
|
|
class input_end,
|
|
class output_begin,
|
|
class output_end>
|
|
auto
|
|
pointers(input_begin&& ib,
|
|
const input_end &ie,
|
|
output_begin&& ob,
|
|
const output_end &oe)
|
|
{
|
|
for(; ib != ie && ob != oe; ++ib, ++ob)
|
|
*ob = std::addressof(*ib);
|
|
|
|
return ob;
|
|
}
|
|
|
|
template<class input_container,
|
|
class output_container>
|
|
auto
|
|
pointers(input_container&& ic,
|
|
output_container &oc)
|
|
{
|
|
return pointers(begin(ic), end(ic), begin(oc), end(oc));
|
|
}
|
|
|
|
} // namespace util
|
|
} // namespace ircd
|