boost-spirit

I would like to define a function taking 2 arguments double func(double t, double x); where the actual implementation is read from an external text file. For example, specifying in the text file function = x*t; the function should implement the multiplication between x and t , so that it could be called at a later stage. I'm trying to parse the function using boost::spirit. But I do not know how to actually achieve it. Below, I created a simple function that implements the multiplication. I bind it to a boost function and I can use it. I also created a simple grammar, which parse the

#include <QtCore/QCoreApplication> #include <boost/spirit/include/qi.hpp> #include <boost/spirit/include/phoenix.hpp> #include <iostream> #include <string> #include <list> #include <map> #define CODE_CPP_KEYWORD_ENUM "enum" namespace haha { //简单表示c++的enum的类（A structure use to simply description C++ enum） struct CPPCodeEnum { //enum的名称（enum Name） ::std::string enumName; //成员的名称（enum Members‘name） ::std::list<::std::string> enumMembers; }; } namespace haha { namespace fusion = boost::fusion; namespace phoenix = boost::phoenix; namespace qi = boost::spirit::qi; namespace ascii = boost::spirit:

When trying to parse text into a boost::variant, the variant's value does not get changed. The parsers by themselves appear to work fine, so my assumption is that I'm doing something wrong with the variant code. I'm using boost 1.46.1 and the following code compiles in Visual Studio 2008. 1st Update hkaiser noted that the rule and grammar template arguments must not be Variant but Variant() . This got a bit "further" as I now have a compilation error in boost_1_46_1\boost\variant\variant.hpp(1304) . The comment says: // NOTE TO USER : // Compile error here indicates that the given type is not

I am having trouble writing what I think should be a simple parser using Boost::Spirit. (I'm using Spirit instead of just using string functions as this is partly a learning exercise for me). Data The data to parse takes the form of key value pairs, where a value can itself be a key value pair. Keys are alphanumeric (with underscores and no digit as first character); values are alphanumeric plus .-_ - the values can be dates in the format DD-MMM-YYYY e.g. 01-Jan-2015 and floating point numbers like 3.1415 in addition to plain old alphanumeric strings. Keys and values are separated with = ;

I'm writing a lexigraphical analyser. It takes an English string, and converts it into a set of latitude/longitude co-ordinates. It's a bit like Google Earth. Anyway, I've written my symbol tables and grammar, and it's happily parsing formatted data. struct LatLongDegrees { std::string dirLat_; double degLat_; std::string dirLong_; double degLong_; } For example: {"North", 23.59, "East", -30.82} Here is my grammar: basic =(latitude >> ' ' >> double_ >> ' ' >> longitude >> ' ' >> double_); Where latitude and longitude are symbol tables that map from shorthand compass directions to strings (eg

I try to implement a Lexer for a little programming language with Boost Spirit. I have to get the value of a token and I get a bad_get exception : terminate called after throwing an instance of 'boost::bad_get' what(): boost::bad_get: failed value get using boost::get Aborted I obtain this exception when doing : std::string contents = "void"; base_iterator_type first = contents.begin(); base_iterator_type last = contents.end(); SimpleLexer<lexer_type> lexer; iter = lexer.begin(first, last); end = lexer.end(); std::cout << "Value = " << boost::get<std::string>(iter->value()) << std::endl; My