mirror of
https://github.com/matrix-construct/construct
synced 2024-11-27 09:12:36 +01:00
93 lines
3.1 KiB
C++
93 lines
3.1 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_STRING_H
|
|
|
|
//
|
|
// String generating patterns
|
|
//
|
|
|
|
namespace ircd {
|
|
inline namespace util
|
|
{
|
|
using string_closure_size = std::function<size_t (const mutable_buffer &)>;
|
|
using string_closure_view = std::function<string_view (const mutable_buffer &)>;
|
|
|
|
// OR this with a string size to trigger a shrink_to_fit() after closure.
|
|
constexpr const size_t SHRINK_TO_FIT
|
|
{
|
|
1UL << (sizeof(size_t) * 8 - 1)
|
|
};
|
|
|
|
// Simple string generation by copy from existing buffer.
|
|
std::string string(const char *const &buf, const size_t &size);
|
|
std::string string(const uint8_t *const &buf, const size_t &size);
|
|
std::string string(const const_buffer &);
|
|
|
|
// String generation from closure. The closure is presented a buffer of
|
|
// size for writing into. Closure returns how much it wrote via size or
|
|
// view of written portion.
|
|
std::string string(const size_t &size, const string_closure_size &);
|
|
std::string string(const size_t &size, const string_closure_view &);
|
|
|
|
// toString()'ish template suite (see defs)
|
|
template<class T> std::string string(const mutable_buffer &buf, const T &s);
|
|
template<class T> std::string string(const T &s);
|
|
|
|
template<class F, class... A> std::string string_buffer(const size_t &, F&&, A&&...);
|
|
}}
|
|
|
|
/// Convenience template for working with various functions throughout IRCd
|
|
/// with the pattern `size_t func(mutable_buffer, ...)`. This function closes
|
|
/// over your function to supply the leading mutable_buffer and use the return
|
|
/// value of your function to satisfy util::string() as usual. The prototype
|
|
/// pattern works with the closures declared in this suite, so string_view
|
|
/// return types work too.
|
|
template<class F,
|
|
class... A>
|
|
std::string
|
|
ircd::util::string_buffer(const size_t &size,
|
|
F&& function,
|
|
A&&... arguments)
|
|
{
|
|
return string(size, [&function, &arguments...]
|
|
(const mutable_buffer &buf)
|
|
{
|
|
return function(buf, std::forward<A>(arguments)...);
|
|
});
|
|
}
|
|
|
|
/// This is the ubiquitous ircd::string() template serving as the "toString()"
|
|
/// for the project. Particpating types that want to have a string(T)
|
|
/// returning an std::string must friend an operator<<(std::ostream &, T);
|
|
/// this is primarily for debug strings, not meant for performance or service.
|
|
///
|
|
template<class T>
|
|
std::string
|
|
ircd::util::string(const T &s)
|
|
{
|
|
std::stringstream ss;
|
|
ss << s;
|
|
return ss.str();
|
|
}
|
|
|
|
/// Alternative to ircd::string() using a provided buffer for the
|
|
/// std::stringstream to avoid allocating one.
|
|
template<class T>
|
|
std::string
|
|
ircd::util::string(const mutable_buffer &buf,
|
|
const T &s)
|
|
{
|
|
std::stringstream ss;
|
|
pubsetbuf(ss, buf);
|
|
ss << s;
|
|
return ss.str();
|
|
}
|