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Code Issues Releases Wiki Activity

ircd::db: Add convenience read(column) nothrow overloads.

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This commit is contained in:
Jason Volk 2018-05-04 15:57:50 -07:00
parent e6fe7805c1
commit f34ebec1cf
2 changed files with 40 additions and 0 deletions
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5
include/ircd/db/column.h
View file

@ -38,6 +38,11 @@ namespace ircd::db
string_view read(column &, const string_view &key, const mutable_buffer &, const gopts & = {});
std::string read(column &, const string_view &key, const gopts & = {});
// [GET] Nothrow convenience functions to copy data into your buffer; since
// a key can exist with an empty value we must overload on this bool here.
string_view read(column &, const string_view &key, bool &found, const mutable_buffer &, const gopts & = {});
std::string read(column &, const string_view &key, bool &found, const gopts & = {});
// [SET] Write data to the db
void write(column &, const string_view &key, const const_buffer &value, const sopts & = {});

35
ircd/db.cc
View file

@ -3863,6 +3863,41 @@ ircd::db::read(column &column,
return ret;
}
std::string
ircd::db::read(column &column,
const string_view &key,
bool &found,
const gopts &gopts)
{
std::string ret;
const auto closure([&ret]
(const string_view &src)
{
ret.assign(begin(src), end(src));
});
found = column(key, std::nothrow, closure, gopts);
return ret;
}
ircd::string_view
ircd::db::read(column &column,
const string_view &key,
bool &found,
const mutable_buffer &buf,
const gopts &gopts)
{
string_view ret;
const auto closure([&buf, &ret]
(const string_view &src)
{
ret = { data(buf), copy(buf, src) };
});
found = column(key, std::nothrow, closure, gopts);
return ret;
}
template<>
ircd::db::prop_str
ircd::db::property(const column &column,