mirror of
https://github.com/matrix-construct/construct
synced 2024-11-26 08:42:34 +01:00
88 lines
2.2 KiB
C++
88 lines
2.2 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_STRING_H
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//
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// String generating patterns
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//
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namespace ircd {
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namespace util {
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/// This is the ubiquitous ircd::string() template serving as the "toString()"
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/// for the project. Particpating types that want to have a string(T)
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/// returning an std::string must friend an operator<<(std::ostream &, T);
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/// this is primarily for debug strings, not meant for performance or service.
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///
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template<class T>
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auto
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string(const T &s)
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{
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std::stringstream ss;
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ss << s;
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return ss.str();
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}
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inline auto
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string(const char *const &buf,
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const size_t &size)
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{
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return std::string{buf, size};
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}
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inline auto
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string(const uint8_t *const &buf,
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const size_t &size)
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{
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return string(reinterpret_cast<const char *>(buf), size);
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}
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/// Close over the common pattern to write directly into a post-C++11 standard
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/// string through the data() member requiring a const_cast. Closure returns
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/// the final size of the data written into the buffer.
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inline auto
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string(const size_t &size,
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const std::function<size_t (const mutable_buffer &)> &closure)
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{
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std::string ret(size, char{});
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const mutable_buffer buf
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{
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const_cast<char *>(ret.data()), ret.size()
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};
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const size_t consumed
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{
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closure(buf)
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};
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assert(consumed <= buffer::size(buf));
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data(buf)[consumed] = '\0';
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ret.resize(consumed);
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return ret;
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}
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/// Close over the common pattern to write directly into a post-C++11 standard
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/// string through the data() member requiring a const_cast. Closure returns
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/// a view of the data actually written to the buffer.
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inline auto
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string(const size_t &size,
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const std::function<string_view (const mutable_buffer &)> &closure)
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{
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return string(size, [&closure]
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(const mutable_buffer &buffer)
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{
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return ircd::size(closure(buffer));
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});
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}
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} // namespace util
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} // namespace ircd
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