boost::urls::grammar::tuple_rule
Match a series of rules in order
Synopsis
Declared in header <boost/url/grammar/tuple_rule.hpp>
template<
class R0,
class... Rn>
constexpr
implementation-defined
tuple_rule(
const R0& r0,
const Rn&... rn) noexcept;Description
This matches a series of rules in the order specified. Upon success the input is adjusted to point to the first unconsumed character. There is no implicit specification of linear white space between each rule.
Value Type
using value_type = __see_below__;The sequence rule usually returns a
std::tuple containing the the value_type
of each corresponding rule in the sequence,
except that void values are removed.
However, if there is exactly one non-void
value type T, then the sequence rule
returns system::result<T> instead of
system::result<tuple<…>>.
Example
Rules are used with the function parse .
system::result< std::tuple< unsigned char, unsigned char, unsigned char, unsigned char > > rv =
parse( "192.168.0.1",
tuple_rule(
dec_octet_rule,
squelch( delim_rule('.') ),
dec_octet_rule,
squelch( delim_rule('.') ),
dec_octet_rule,
squelch( delim_rule('.') ),
dec_octet_rule ) );See Also
dec_octet_rule , delim_rule , parse , squelch .