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ircd::util: Add string construction buffer closures over a common pattern.

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This commit is contained in:
Jason Volk 2018-01-29 08:19:14 -08:00
parent f1611a4a54
commit bce1206c70
1 changed files with 31 additions and 0 deletions
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31
include/ircd/util/util.h
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@ -169,6 +169,37 @@ string(const uint8_t *const &buf,
return string(reinterpret_cast<const char *>(buf), size);
}
/// Close over the common pattern to write directly into a post-C++11 standard
/// string through the data() member requiring a const_cast. Closure returns
/// the final size of the data written into the buffer.
inline auto
string(const size_t &size,
const std::function<size_t (const mutable_buffer &)> &closure)
{
std::string ret(size, char{});
const mutable_buffer buf
{
const_cast<char *>(ret.data()), ret.size()
};
ret.resize(closure(buf));
return ret;
}
/// Close over the common pattern to write directly into a post-C++11 standard
/// string through the data() member requiring a const_cast. Closure returns
/// a view of the data actually written to the buffer.
inline auto
string(const size_t &size,
const std::function<string_view (const mutable_buffer &)> &closure)
{
return string(size, [&closure]
(const mutable_buffer &buffer)
{
return ircd::size(closure(buffer));
});
}
//
// Misc bang participants
//