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ircd::buffer: Add window_buffer::rewind(n).

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This commit is contained in:
Jason Volk 2018-03-17 12:34:04 -07:00
parent 373a791158
commit b528920420
1 changed files with 11 additions and 0 deletions
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11
include/ircd/buffer/window_buffer.h
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@ -36,6 +36,7 @@ struct ircd::buffer::window_buffer
mutable_buffer completed();
const_buffer operator()(const closure &closure);
const_buffer rewind(const size_t &n = 1);
window_buffer(const mutable_buffer &base);
};
@ -46,6 +47,16 @@ ircd::buffer::window_buffer::window_buffer(const mutable_buffer &base)
,base{base}
{}
inline ircd::buffer::const_buffer
ircd::buffer::window_buffer::rewind(const size_t &n)
{
const size_t nmax{std::min(n, consumed())};
static_cast<mutable_buffer &>(*this).begin() -= nmax;
assert(base.begin() <= begin());
assert(begin() <= base.end());
return completed();
}
inline ircd::buffer::const_buffer
ircd::buffer::window_buffer::operator()(const closure &closure)
{