mirror of
https://github.com/matrix-construct/construct
synced 2024-08-20 16:44:43 +02:00
716 lines
18 KiB
C++
716 lines
18 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_BUFFER_H
|
|
|
|
// Forward declarations from boost::asio because it is not included here. IRCd
|
|
// buffers are not based directly on the boost ones but are easily converted
|
|
// when passing our buffer to an asio function.
|
|
namespace boost::asio
|
|
{
|
|
struct const_buffer;
|
|
struct mutable_buffer;
|
|
}
|
|
|
|
/// Lightweight buffer interface compatible with boost::asio IO buffers and vectors
|
|
///
|
|
/// A const_buffer is a pair of iterators like `const char *` meant for sending
|
|
/// data; a mutable_buffer is a pair of iterators meant for receiving.
|
|
///
|
|
/// These templates offer tools for individual buffers as well as tools for
|
|
/// iterations of buffers. An iteration of buffers is an iovector that is
|
|
/// passed to our sockets etc. The ircd::iov template can host an iteration of
|
|
/// buffers. The `template template` functions are tools for a container of
|
|
/// buffers of any permutation.
|
|
///
|
|
namespace ircd::buffer
|
|
{
|
|
template<class it> struct buffer;
|
|
struct const_buffer;
|
|
struct mutable_buffer;
|
|
struct window_buffer;
|
|
template<class buffer, size_t SIZE> struct fixed_buffer;
|
|
template<class buffer, uint align = 16> struct unique_buffer;
|
|
|
|
template<size_t SIZE> using fixed_const_buffer = fixed_buffer<const_buffer, SIZE>;
|
|
template<size_t SIZE> using fixed_mutable_buffer = fixed_buffer<mutable_buffer, SIZE>;
|
|
template<template<class> class I> using const_buffers = I<const_buffer>;
|
|
template<template<class> class I> using mutable_buffers = I<mutable_buffer>;
|
|
|
|
// Single buffer iteration of contents
|
|
template<class it> const it &begin(const buffer<it> &buffer);
|
|
template<class it> const it &end(const buffer<it> &buffer);
|
|
template<class it> it &begin(buffer<it> &buffer);
|
|
template<class it> it &end(buffer<it> &buffer);
|
|
template<class it> std::reverse_iterator<it> rbegin(const buffer<it> &buffer);
|
|
template<class it> std::reverse_iterator<it> rend(const buffer<it> &buffer);
|
|
|
|
// Single buffer tools
|
|
template<class it> bool null(const buffer<it> &buffer);
|
|
template<class it> bool full(const buffer<it> &buffer);
|
|
template<class it> bool empty(const buffer<it> &buffer);
|
|
template<class it> bool operator!(const buffer<it> &buffer);
|
|
template<class it> size_t size(const buffer<it> &buffer);
|
|
template<class it> const it &data(const buffer<it> &buffer);
|
|
template<class it> size_t consume(buffer<it> &buffer, const size_t &bytes);
|
|
template<class it> buffer<it> operator+(const buffer<it> &buffer, const size_t &bytes);
|
|
template<class it> it copy(it &dest, const it &stop, const const_buffer &);
|
|
template<size_t SIZE> size_t copy(const mutable_buffer &dst, const char (&buf)[SIZE]);
|
|
size_t copy(const mutable_buffer &dst, const const_buffer &src);
|
|
size_t reverse(const mutable_buffer &dst, const const_buffer &src);
|
|
void reverse(const mutable_buffer &buf);
|
|
void zero(const mutable_buffer &buf);
|
|
|
|
// Iterable of buffers tools
|
|
template<template<class> class I, class T> size_t size(const I<T> &buffers);
|
|
template<template<class> class I, class T> size_t copy(const mutable_buffer &, const I<T> &buffer);
|
|
template<template<class> class I, class T> size_t consume(I<T> &buffers, const size_t &bytes);
|
|
|
|
// Convenience copy to std stream
|
|
template<class it> std::ostream &operator<<(std::ostream &s, const buffer<it> &buffer);
|
|
template<template<class> class I, class T> std::ostream &operator<<(std::ostream &s, const I<T> &buffers);
|
|
|
|
// Preconstructed null buffers
|
|
extern const mutable_buffer null_buffer;
|
|
extern const ilist<mutable_buffer> null_buffers;
|
|
}
|
|
|
|
// Export these important aliases down to main ircd namespace
|
|
namespace ircd
|
|
{
|
|
using buffer::const_buffer;
|
|
using buffer::mutable_buffer;
|
|
using buffer::fixed_buffer;
|
|
using buffer::unique_buffer;
|
|
using buffer::null_buffer;
|
|
using buffer::window_buffer;
|
|
using buffer::fixed_const_buffer;
|
|
using buffer::fixed_mutable_buffer;
|
|
|
|
using buffer::const_buffers;
|
|
using buffer::mutable_buffers;
|
|
|
|
using buffer::size;
|
|
using buffer::data;
|
|
using buffer::copy;
|
|
using buffer::consume;
|
|
}
|
|
|
|
/// Base for all buffer types
|
|
///
|
|
template<class it>
|
|
struct ircd::buffer::buffer
|
|
:std::tuple<it, it>
|
|
{
|
|
using iterator = it;
|
|
using value_type = typename std::remove_pointer<iterator>::type;
|
|
|
|
operator string_view() const;
|
|
explicit operator std::string_view() const;
|
|
explicit operator std::string() const;
|
|
|
|
auto &begin() const { return std::get<0>(*this); }
|
|
auto &begin() { return std::get<0>(*this); }
|
|
auto &end() const { return std::get<1>(*this); }
|
|
auto &end() { return std::get<1>(*this); }
|
|
|
|
auto &operator[](const size_t &i) const
|
|
{
|
|
return *(begin() + i);
|
|
}
|
|
|
|
auto &operator[](const size_t &i)
|
|
{
|
|
return *(begin() + i);
|
|
}
|
|
|
|
buffer(const it &start, const it &stop)
|
|
:std::tuple<it, it>{start, stop}
|
|
{}
|
|
|
|
buffer(const it &start, const size_t &size)
|
|
:buffer{start, start + size}
|
|
{}
|
|
|
|
buffer()
|
|
:buffer{nullptr, nullptr}
|
|
{}
|
|
};
|
|
|
|
/// Base for mutable buffers, or buffers which can be written to because they
|
|
/// are not const.
|
|
///
|
|
struct ircd::buffer::mutable_buffer
|
|
:buffer<char *>
|
|
{
|
|
// Conversion offered for the analogous asio buffer
|
|
operator boost::asio::mutable_buffer() const;
|
|
|
|
// Allows boost::spirit to append to the buffer; this means the size() of
|
|
// this buffer becomes a consumption counter and the real size of the buffer
|
|
// must be kept separately. This is the lowlevel basis for a stream buffer.
|
|
void insert(char *const &it, const value_type &v)
|
|
{
|
|
assert(it >= this->begin() && it <= this->end());
|
|
memmove(it + 1, it, std::distance(it, this->end()));
|
|
*it = v;
|
|
++std::get<1>(*this);
|
|
}
|
|
|
|
using buffer<char *>::buffer;
|
|
|
|
mutable_buffer()
|
|
:buffer<char *>{}
|
|
{}
|
|
|
|
mutable_buffer(const buffer<char *> &b)
|
|
:buffer<char *>{b}
|
|
{}
|
|
|
|
template<size_t SIZE>
|
|
mutable_buffer(char (&buf)[SIZE])
|
|
:buffer<char *>{buf, SIZE}
|
|
{}
|
|
|
|
template<size_t SIZE>
|
|
mutable_buffer(std::array<char, SIZE> &buf)
|
|
:buffer<char *>{buf.data(), SIZE}
|
|
{}
|
|
|
|
// lvalue string reference offered to write through to a std::string as
|
|
// the buffer. not explicit; should be hard to bind by accident...
|
|
mutable_buffer(std::string &buf)
|
|
:mutable_buffer{const_cast<char *>(buf.data()), buf.size()}
|
|
{}
|
|
|
|
mutable_buffer(const std::function<void (const mutable_buffer &)> &closure)
|
|
{
|
|
closure(*this);
|
|
}
|
|
};
|
|
|
|
struct ircd::buffer::const_buffer
|
|
:buffer<const char *>
|
|
{
|
|
operator boost::asio::const_buffer() const;
|
|
|
|
using buffer<const char *>::buffer;
|
|
|
|
const_buffer()
|
|
:buffer<const char *>{}
|
|
{}
|
|
|
|
const_buffer(const buffer<const char *> &b)
|
|
:buffer<const char *>{b}
|
|
{}
|
|
|
|
const_buffer(const buffer<char *> &b)
|
|
:buffer<const char *>{data(b), size(b)}
|
|
{}
|
|
|
|
template<size_t SIZE>
|
|
const_buffer(const char (&buf)[SIZE])
|
|
:buffer<const char *>{buf, SIZE}
|
|
{}
|
|
|
|
template<size_t SIZE>
|
|
const_buffer(const std::array<char, SIZE> &buf)
|
|
:buffer<const char *>{reinterpret_cast<const char *>(buf.data()), SIZE}
|
|
{}
|
|
|
|
const_buffer(const mutable_buffer &b)
|
|
:buffer<const char *>{data(b), size(b)}
|
|
{}
|
|
|
|
const_buffer(const string_view &s)
|
|
:buffer<const char *>{data(s), size(s)}
|
|
{}
|
|
};
|
|
|
|
/// fixed_buffer wraps an std::array with construction and conversions apropos
|
|
/// the ircd::buffer suite. fixed_buffer should be punnable. Its only memory
|
|
/// footprint is the array itself and
|
|
///
|
|
template<class buffer,
|
|
size_t SIZE>
|
|
struct ircd::buffer::fixed_buffer
|
|
:std::array<typename std::remove_const<typename buffer::value_type>::type, SIZE>
|
|
{
|
|
using mutable_type = typename std::remove_const<typename buffer::value_type>::type;
|
|
using const_type = typename std::add_const<mutable_type>::type;
|
|
using array_type = std::array<mutable_type, SIZE>;
|
|
|
|
operator buffer() const
|
|
{
|
|
return { std::begin(*this), std::end(*this) };
|
|
}
|
|
|
|
operator buffer()
|
|
{
|
|
return { std::begin(*this), std::end(*this) };
|
|
}
|
|
|
|
using array_type::array_type;
|
|
fixed_buffer(const nullptr_t &)
|
|
:array_type{{0}}
|
|
{}
|
|
|
|
fixed_buffer(const std::function<void (const mutable_buffer &)> &closure)
|
|
{
|
|
closure(mutable_buffer{reinterpret_cast<mutable_buffer::iterator>(this->data()), this->size()});
|
|
}
|
|
|
|
fixed_buffer(buffer b)
|
|
:array_type{std::begin(b), std::end(b)}
|
|
{}
|
|
|
|
fixed_buffer() = default;
|
|
};
|
|
|
|
static_assert
|
|
(
|
|
// Assertion over an arbitrary but common template configuration.
|
|
std::is_standard_layout<ircd::buffer::fixed_buffer<ircd::buffer::const_buffer, 32>>::value,
|
|
"ircd::buffer::fixed_buffer must be standard layout"
|
|
);
|
|
|
|
/// The window_buffer is just two mutable_buffers. One of the two buffers
|
|
/// just spans an underlying space and the other buffer is a window of the
|
|
/// remaining space which shrinks toward the end as the space is consumed.
|
|
/// The window_buffer object inherits from the latter, so it always has the
|
|
/// appearance of a mutable_buffer windowing on the the next place to write.
|
|
///
|
|
/// The recommended usage of this device is actually through the operator()
|
|
/// closure, which will automatically resize the window based on the return
|
|
/// value in the closure.
|
|
///
|
|
struct ircd::buffer::window_buffer
|
|
:mutable_buffer
|
|
{
|
|
mutable_buffer base;
|
|
|
|
/// Bytes remaining for writes to the stream buffer (same as size(*this))
|
|
size_t remaining() const
|
|
{
|
|
assert(begin() <= base.end());
|
|
const size_t ret(std::distance(begin(), base.end()));
|
|
assert(ret == size(*this));
|
|
return ret;
|
|
}
|
|
|
|
/// Bytes used by writes to the stream buffer
|
|
size_t consumed() const
|
|
{
|
|
assert(begin() >= base.begin());
|
|
assert(begin() <= base.end());
|
|
return std::distance(base.begin(), begin());
|
|
}
|
|
|
|
/// View the completed portion of the stream
|
|
const_buffer completed() const
|
|
{
|
|
assert(base.begin() <= begin());
|
|
assert(base.begin() + consumed() <= base.end());
|
|
return { base.begin(), base.begin() + consumed() };
|
|
}
|
|
|
|
/// View the completed portion of the stream
|
|
mutable_buffer completed()
|
|
{
|
|
assert(base.begin() <= begin());
|
|
assert(base.begin() + consumed() <= base.end());
|
|
return { base.begin(), base.begin() + consumed() };
|
|
}
|
|
|
|
/// Convenience conversion to get the completed portion
|
|
explicit operator const_buffer() const
|
|
{
|
|
return completed();
|
|
}
|
|
|
|
/// Convenience closure presenting the writable window and advancing the
|
|
/// window with a consume() for the bytes written in the closure.
|
|
using closure = std::function<size_t (const mutable_buffer &)>;
|
|
void operator()(const closure &closure)
|
|
{
|
|
consume(*this, closure(*this));
|
|
}
|
|
|
|
window_buffer(const mutable_buffer &base)
|
|
:mutable_buffer{base}
|
|
,base{base}
|
|
{}
|
|
};
|
|
|
|
/// Like unique_ptr, this template holds ownership of an allocated buffer
|
|
///
|
|
template<class buffer,
|
|
uint alignment>
|
|
struct ircd::buffer::unique_buffer
|
|
:buffer
|
|
{
|
|
unique_buffer(std::unique_ptr<uint8_t[]> &&, const size_t &size);
|
|
unique_buffer(const size_t &size);
|
|
unique_buffer();
|
|
unique_buffer(unique_buffer &&) noexcept;
|
|
unique_buffer(const unique_buffer &) = delete;
|
|
unique_buffer &operator=(unique_buffer &&) noexcept;
|
|
unique_buffer &operator=(const unique_buffer &) = delete;
|
|
~unique_buffer() noexcept;
|
|
};
|
|
|
|
template<class buffer,
|
|
uint alignment>
|
|
ircd::buffer::unique_buffer<buffer, alignment>::unique_buffer()
|
|
:buffer
|
|
{
|
|
nullptr, nullptr
|
|
}
|
|
{}
|
|
|
|
template<class buffer,
|
|
uint alignment>
|
|
ircd::buffer::unique_buffer<buffer, alignment>::unique_buffer(std::unique_ptr<uint8_t[]> &&b,
|
|
const size_t &size)
|
|
:buffer
|
|
{
|
|
typename buffer::iterator(b.release()), size
|
|
}
|
|
{}
|
|
|
|
template<class buffer,
|
|
uint alignment>
|
|
ircd::buffer::unique_buffer<buffer, alignment>::unique_buffer(const size_t &size)
|
|
:unique_buffer<buffer, alignment>
|
|
{
|
|
std::unique_ptr<uint8_t[]>
|
|
{
|
|
//TODO: Can't use a template parameter to the attribute even though
|
|
// it's known at compile time. Hardcoding this until fixed with better
|
|
// aligned dynamic memory.
|
|
//new __attribute__((aligned(alignment))) uint8_t[size]
|
|
new __attribute__((aligned(16))) uint8_t[size]
|
|
},
|
|
size
|
|
}
|
|
{
|
|
// Alignment can only be 16 bytes for now
|
|
assert(alignment == 16);
|
|
}
|
|
|
|
template<class buffer,
|
|
uint alignment>
|
|
ircd::buffer::unique_buffer<buffer, alignment>::unique_buffer(unique_buffer &&other)
|
|
noexcept
|
|
:buffer
|
|
{
|
|
std::move(static_cast<buffer &>(other))
|
|
}
|
|
{
|
|
get<0>(other) = nullptr;
|
|
}
|
|
|
|
template<class buffer,
|
|
uint alignment>
|
|
ircd::buffer::unique_buffer<buffer, alignment> &
|
|
ircd::buffer::unique_buffer<buffer, alignment>::operator=(unique_buffer &&other)
|
|
noexcept
|
|
{
|
|
this->~unique_buffer();
|
|
|
|
static_cast<buffer &>(*this) = std::move(static_cast<buffer &>(other));
|
|
get<0>(other) = nullptr;
|
|
|
|
return *this;
|
|
}
|
|
|
|
template<class buffer,
|
|
uint alignment>
|
|
ircd::buffer::unique_buffer<buffer, alignment>::~unique_buffer()
|
|
noexcept
|
|
{
|
|
delete[] data(*this);
|
|
}
|
|
|
|
template<template<class>
|
|
class buffers,
|
|
class T>
|
|
std::ostream &
|
|
ircd::buffer::operator<<(std::ostream &s, const buffers<T> &b)
|
|
{
|
|
using it = typename T::iterator;
|
|
|
|
std::for_each(std::begin(b), std::end(b), [&s]
|
|
(const buffer<it> &b)
|
|
{
|
|
s << b;
|
|
});
|
|
|
|
return s;
|
|
}
|
|
|
|
template<template<class>
|
|
class buffers,
|
|
class T>
|
|
size_t
|
|
ircd::buffer::consume(buffers<T> &b,
|
|
const size_t &bytes)
|
|
{
|
|
ssize_t remain(bytes);
|
|
for(auto it(std::begin(b)); it != std::end(b) && remain > 0; ++it)
|
|
{
|
|
using buffer = typename buffers<T>::value_type;
|
|
using iterator = typename buffer::iterator;
|
|
|
|
buffer &b(const_cast<buffer &>(*it));
|
|
const ssize_t bsz(size(b));
|
|
const ssize_t csz{std::min(remain, bsz)};
|
|
remain -= consume(b, csz);
|
|
assert(remain >= 0);
|
|
}
|
|
|
|
assert(ssize_t(bytes) >= remain);
|
|
return bytes - remain;
|
|
}
|
|
|
|
template<template<class>
|
|
class buffers,
|
|
class T>
|
|
size_t
|
|
ircd::buffer::copy(const mutable_buffer &dest,
|
|
const buffers<T> &b)
|
|
{
|
|
using it = typename T::iterator;
|
|
|
|
size_t ret(0);
|
|
for(const buffer<it> &b : b)
|
|
ret += copy(data(dest) + ret, size(dest) - ret, b);
|
|
|
|
return ret;
|
|
}
|
|
|
|
template<template<class>
|
|
class buffers,
|
|
class T>
|
|
size_t
|
|
ircd::buffer::size(const buffers<T> &b)
|
|
{
|
|
using it = typename T::iterator;
|
|
|
|
return std::accumulate(std::begin(b), std::end(b), size_t(0), []
|
|
(auto ret, const buffer<it> &b)
|
|
{
|
|
return ret += size(b);
|
|
});
|
|
}
|
|
|
|
template<class it>
|
|
std::ostream &
|
|
ircd::buffer::operator<<(std::ostream &s, const buffer<it> &buffer)
|
|
{
|
|
assert(!null(buffer) || get<1>(buffer) == nullptr);
|
|
s.write(data(buffer), size(buffer));
|
|
return s;
|
|
}
|
|
|
|
inline void
|
|
ircd::buffer::reverse(const mutable_buffer &buf)
|
|
{
|
|
std::reverse(data(buf), data(buf) + size(buf));
|
|
}
|
|
|
|
inline size_t
|
|
ircd::buffer::reverse(const mutable_buffer &dst,
|
|
const const_buffer &src)
|
|
{
|
|
const size_t ret{std::min(size(dst), size(src))};
|
|
std::reverse_copy(data(src), data(src) + ret, data(dst));
|
|
return ret;
|
|
}
|
|
|
|
template<size_t SIZE>
|
|
__attribute__((error
|
|
(
|
|
"Copy source is an array. Is this a string literal? Do you want to copy the \\0?"
|
|
" Disambiguate this by typing the source string_view or const_buffer."
|
|
)))
|
|
inline size_t
|
|
ircd::buffer::copy(const mutable_buffer &dst,
|
|
const char (&buf)[SIZE])
|
|
{
|
|
return copy(dst, const_buffer{buf});
|
|
}
|
|
|
|
inline size_t
|
|
ircd::buffer::copy(const mutable_buffer &dst,
|
|
const const_buffer &src)
|
|
{
|
|
auto e{begin(dst)};
|
|
copy(e, end(dst), src);
|
|
assert(std::distance(begin(dst), e) >= 0);
|
|
return std::distance(begin(dst), e);
|
|
}
|
|
|
|
template<class it>
|
|
it
|
|
ircd::buffer::copy(it &dest,
|
|
const it &stop,
|
|
const const_buffer &src)
|
|
{
|
|
const it ret{dest};
|
|
const ssize_t srcsz(size(src));
|
|
assert(ret <= stop);
|
|
const ssize_t remain{std::distance(ret, stop)};
|
|
const ssize_t cpsz{std::min(srcsz, remain)};
|
|
assert(cpsz <= srcsz);
|
|
assert(cpsz <= remain);
|
|
assert(remain >= 0);
|
|
memcpy(ret, data(src), cpsz);
|
|
dest += cpsz;
|
|
assert(dest <= stop);
|
|
return ret;
|
|
}
|
|
|
|
template<class it>
|
|
ircd::buffer::buffer<it>
|
|
ircd::buffer::operator+(const buffer<it> &buffer,
|
|
const size_t &bytes)
|
|
{
|
|
const size_t advance
|
|
{
|
|
std::min(bytes, size(buffer))
|
|
};
|
|
|
|
return
|
|
{
|
|
begin(buffer) + advance, size(buffer) - advance
|
|
};
|
|
}
|
|
|
|
template<class it>
|
|
size_t
|
|
ircd::buffer::consume(buffer<it> &buffer,
|
|
const size_t &bytes)
|
|
{
|
|
assert(!null(buffer));
|
|
assert(bytes <= size(buffer));
|
|
get<0>(buffer) += bytes;
|
|
assert(get<0>(buffer) <= get<1>(buffer));
|
|
return size(buffer);
|
|
}
|
|
|
|
template<class it>
|
|
const it &
|
|
ircd::buffer::data(const buffer<it> &buffer)
|
|
{
|
|
return get<0>(buffer);
|
|
}
|
|
|
|
template<class it>
|
|
size_t
|
|
ircd::buffer::size(const buffer<it> &buffer)
|
|
{
|
|
assert(get<0>(buffer) <= get<1>(buffer));
|
|
assert(!null(buffer) || get<1>(buffer) == nullptr);
|
|
return std::distance(get<0>(buffer), get<1>(buffer));
|
|
}
|
|
|
|
template<class it>
|
|
bool
|
|
ircd::buffer::operator!(const buffer<it> &buffer)
|
|
{
|
|
return empty(buffer);
|
|
}
|
|
|
|
template<class it>
|
|
bool
|
|
ircd::buffer::empty(const buffer<it> &buffer)
|
|
{
|
|
return null(buffer) || std::distance(get<0>(buffer), get<1>(buffer)) == 0;
|
|
}
|
|
|
|
template<class it>
|
|
bool
|
|
ircd::buffer::full(const buffer<it> &buffer)
|
|
{
|
|
return std::distance(get<0>(buffer), get<1>(buffer)) == 0;
|
|
}
|
|
|
|
template<class it>
|
|
bool
|
|
ircd::buffer::null(const buffer<it> &buffer)
|
|
{
|
|
return get<0>(buffer) == nullptr;
|
|
}
|
|
|
|
template<class it>
|
|
std::reverse_iterator<it>
|
|
ircd::buffer::rend(const buffer<it> &buffer)
|
|
{
|
|
return std::reverse_iterator<it>(get<0>(buffer));
|
|
}
|
|
|
|
template<class it>
|
|
std::reverse_iterator<it>
|
|
ircd::buffer::rbegin(const buffer<it> &buffer)
|
|
{
|
|
return std::reverse_iterator<it>(get<0>(buffer) + size(buffer));
|
|
}
|
|
|
|
template<class it>
|
|
it &
|
|
ircd::buffer::end(buffer<it> &buffer)
|
|
{
|
|
return get<1>(buffer);
|
|
}
|
|
|
|
template<class it>
|
|
it &
|
|
ircd::buffer::begin(buffer<it> &buffer)
|
|
{
|
|
return get<0>(buffer);
|
|
}
|
|
|
|
template<class it>
|
|
const it &
|
|
ircd::buffer::end(const buffer<it> &buffer)
|
|
{
|
|
return get<1>(buffer);
|
|
}
|
|
|
|
template<class it>
|
|
const it &
|
|
ircd::buffer::begin(const buffer<it> &buffer)
|
|
{
|
|
return get<0>(buffer);
|
|
}
|
|
|
|
template<class it>
|
|
ircd::buffer::buffer<it>::operator std::string()
|
|
const
|
|
{
|
|
return { reinterpret_cast<const char *>(data(*this)), size(*this) };
|
|
}
|
|
|
|
template<class it>
|
|
ircd::buffer::buffer<it>::operator std::string_view()
|
|
const
|
|
{
|
|
return { reinterpret_cast<const char *>(data(*this)), size(*this) };
|
|
}
|
|
|
|
template<class it>
|
|
ircd::buffer::buffer<it>::operator string_view()
|
|
const
|
|
{
|
|
return { reinterpret_cast<const char *>(data(*this)), size(*this) };
|
|
}
|