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ircd:Ⓜ️🆔 Elide re-parsing on buffer copying and allow empty buffers.

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This commit is contained in:
Jason Volk 2018-03-16 15:06:53 -07:00
parent 61009aed64
commit a632db39d0
1 changed files with 28 additions and 14 deletions
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42
include/ircd/m/id.h
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@ -214,7 +214,7 @@ namespace ircd::m
/// ID object backed by an internal buffer of default worst-case size.
///
template<class T,
size_t MAX = 256>
size_t MAX>
struct ircd::m::id::buf
:T
{
@ -254,29 +254,43 @@ struct ircd::m::id::buf
buf() = default;
buf(buf &&other) noexcept
:T{b, std::move(other)}
{}
buf(const buf &other)
:T{b, other}
{}
:T{}
{
static_cast<string_view &>(*this) =
{
b.data(), buffer::copy(b, string_view{other})
};
}
buf(buf &&other) noexcept
:T{}
{
static_cast<string_view &>(*this) =
{
b.data(), buffer::copy(b, string_view{other})
};
}
buf &operator=(const buf &other)
{
static_cast<T &>(*this) = T{b, other};
this->~buf();
static_cast<string_view &>(*this) =
{
b.data(), buffer::copy(b, string_view{other})
};
return *this;
}
buf &operator=(buf &&other) noexcept
{
static_cast<T &>(*this) = T{b, std::move(other)};
return *this;
}
this->~buf();
static_cast<string_view &>(*this) =
{
b.data(), buffer::copy(b, string_view{other})
};
buf &operator=(const string_view &s)
{
static_cast<T &>(*this) = T{b, s};
return *this;
}
};