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Parsers in Spirit are fully
attributed. Spirit.X3 parsers always expose
an attribute specific to their type. This is called synthesized
attribute as it is returned from a successful match representing
the matched input sequence. For instance, numeric parsers, such as int_
or double_
,
return the int
or double
value converted from the matched input
sequence. Other primitive parser components have other intuitive attribute
types, such as for instance int_
which has int
, or ascii::char_
which has char
.
Primitive parsers apply the normal C++ convertibility rules: you can use
any C++ type to receive the parsed value as long as the attribute type of
the parser is convertible to the type provided. The following example shows
how a synthesized parser attribute (the int
value) is extracted by calling the API function x3::parse
:
int value = 0; std::string str("123"); std::string::iterator strbegin = str.begin(); x3::parse(strbegin, str.end(), int_, value); // value == 123
For a full list of available parser primitives and their attribute types please see the sections X3 Parsers.