mirror of
https://github.com/matrix-construct/construct
synced 2024-06-30 07:48:22 +02:00
94 lines
3.1 KiB
C++
94 lines
3.1 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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inline namespace util
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{
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using string_closure_size = std::function<size_t (const mutable_buffer &)>;
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using string_closure_view = std::function<string_view (const mutable_buffer &)>;
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// OR this with a string size to trigger a shrink_to_fit() after closure.
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constexpr const size_t SHRINK_TO_FIT
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{
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1UL << (sizeof(size_t) * 8 - 1)
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};
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// Simple string generation by copy from existing buffer.
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std::string string(const char *const &buf, const size_t &size);
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std::string string(const uint8_t *const &buf, const size_t &size);
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std::string string(const const_buffer &);
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// String generation from closure. The closure is presented a buffer of
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// size for writing into. Closure returns how much it wrote via size or
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// view of written portion.
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std::string string(const size_t &size, const string_closure_size &);
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std::string string(const size_t &size, const string_closure_view &);
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// toString()'ish template suite (see defs)
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template<class T> std::string string(const mutable_buffer &buf, const T &s);
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template<class T> std::string string(const T &s);
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template<class F, class... A> std::string string_buffer(const size_t &, F&&, A&&...);
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}}
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/// Convenience template for working with various functions throughout IRCd
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/// with the pattern `size_t func(mutable_buffer, ...)`. This function closes
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/// over your function to supply the leading mutable_buffer and use the return
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/// value of your function to satisfy util::string() as usual. The prototype
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/// pattern works with the closures declared in this suite, so string_view
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/// return types work too.
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template<class F,
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class... A>
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std::string
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ircd::util::string_buffer(const size_t &size,
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F&& function,
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A&&... arguments)
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{
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return string(size, [&function, &arguments...]
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(const mutable_buffer &buf)
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{
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return function(buf, std::forward<A>(arguments)...);
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});
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}
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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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std::string
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ircd::util::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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/// Alternative to ircd::string() using a provided buffer for the
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/// std::stringstream to avoid allocating one.
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template<class T>
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std::string
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ircd::util::string(const mutable_buffer &buf,
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const T &s)
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{
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std::stringstream ss;
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pubsetbuf(ss, buf);
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ss << s;
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return ss.str();
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}
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