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ircd::util: Add string_buffer() reclosure template.

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This commit is contained in:
Jason Volk 2019-02-07 18:28:52 -08:00
parent cc636d375f
commit 9f7db84dd3
1 changed files with 22 additions and 0 deletions
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22
include/ircd/util/string.h
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@ -40,6 +40,28 @@ namespace ircd::util
// toString()'ish template suite (see defs) // toString()'ish template suite (see defs)
template<class T> std::string string(const mutable_buffer &buf, const T &s); template<class T> std::string string(const mutable_buffer &buf, const T &s);
template<class T> std::string string(const T &s); template<class T> std::string string(const T &s);
template<class F, class... A> std::string string_buffer(const size_t &, F&&, A&&...);
}
/// Convenience template for working with various functions throughout IRCd
/// with the pattern `size_t func(mutable_buffer, ...)`. This function closes
/// over your function to supply the leading mutable_buffer and use the return
/// value of your function to satisfy util::string() as usual. The prototype
/// pattern works with the closures declared in this suite, so string_view
/// return types work too.
template<class F,
class... A>
std::string
ircd::util::string_buffer(const size_t &size,
F&& function,
A&&... arguments)
{
return string(size, [&function, &arguments...]
(const mutable_buffer &buf)
{
return function(buf, std::forward<A>(arguments)...);
});
} }
/// This is the ubiquitous ircd::string() template serving as the "toString()" /// This is the ubiquitous ircd::string() template serving as the "toString()"