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ircd::buffer: Add fixed_buffer with construction closure; minor cleanup.

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This commit is contained in:
Jason Volk 2017-10-05 18:32:48 -07:00
parent d83ea848da
commit 51f5045c06
1 changed files with 67 additions and 2 deletions
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69
include/ircd/buffer.h
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@ -55,8 +55,14 @@ namespace ircd::buffer
struct mutable_buffer;
struct const_raw_buffer;
struct mutable_raw_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<size_t SIZE> using fixed_const_raw_buffer = fixed_buffer<const_raw_buffer, SIZE>;
template<size_t SIZE> using fixed_mutable_raw_buffer = fixed_buffer<mutable_raw_buffer, SIZE>;
template<template<class> class I> using const_buffers = I<const_buffer>;
template<template<class> class I> using mutable_buffers = I<mutable_buffer>;
template<template<class> class I> using const_raw_buffers = I<const_raw_buffer>;
@ -100,8 +106,13 @@ namespace ircd
using buffer::mutable_buffer;
using buffer::const_raw_buffer;
using buffer::mutable_raw_buffer;
using buffer::fixed_buffer;
using buffer::unique_buffer;
using buffer::null_buffer;
using buffer::fixed_const_buffer;
using buffer::fixed_mutable_buffer;
using buffer::fixed_const_raw_buffer;
using buffer::fixed_mutable_raw_buffer;
using buffer::const_buffers;
using buffer::mutable_buffers;
@ -175,7 +186,9 @@ struct ircd::buffer::mutable_buffer_base
}
using buffer<T>::buffer;
mutable_buffer_base(): buffer<iterator>{} {}
mutable_buffer_base()
:buffer<iterator>{} {}
template<size_t SIZE>
mutable_buffer_base(value_type (&buf)[SIZE])
@ -205,6 +218,11 @@ struct ircd::buffer::mutable_buffer
operator boost::asio::mutable_buffer() const;
using mutable_buffer_base<char *>::mutable_buffer_base;
mutable_buffer(const std::function<void (const mutable_buffer &)> &closure)
{
closure(*this);
}
};
/// A writable buffer of unsigned signed char data. Convention is for this
@ -224,6 +242,11 @@ struct ircd::buffer::mutable_raw_buffer
mutable_raw_buffer(const mutable_buffer &b)
:mutable_buffer_base<iterator>{reinterpret_cast<iterator>(data(b)), size(b)}
{}
mutable_raw_buffer(const std::function<void (const mutable_raw_buffer &)> &closure)
{
closure(*this);
}
};
namespace ircd::buffer
@ -240,7 +263,10 @@ struct ircd::buffer::const_buffer_base
using mutable_value_type = typename std::remove_const<value_type>::type;
using buffer<T>::buffer;
const_buffer_base(): buffer<iterator>{} {}
const_buffer_base()
:buffer<iterator>{}
{}
template<size_t SIZE>
const_buffer_base(const value_type (&buf)[SIZE])
@ -297,6 +323,45 @@ struct ircd::buffer::const_raw_buffer
{}
};
/// fixed_buffer wraps an std::array with construction and conversions apropos
/// the ircd::buffer suite
///
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_raw_buffer &)> &closure)
{
closure(mutable_raw_buffer{std::begin(*this), std::end(*this)});
}
fixed_buffer(buffer b)
:array_type{std::begin(b), std::end(b)}
{}
fixed_buffer() = default;
};
/// Like unique_ptr, this template holds ownership of an allocated buffer
///
///