There were a couple of typos, but I made a few mods and it works now. Essentially your static_visitor class is mutating itself on each visit, so the operator() methods can't be const.
#include <string>
#include <sstream>
#include <vector>
#include <boost/variant.hpp>
#include <boost/foreach.hpp>
#include <iostream>
struct TypeA
{
int varA;
int varB;
};
struct TypeB
{
std::string varA;
std::string varB;
};
typedef boost::variant<TypeA, TypeB> MyVariantType;
class MyCommandVisitor : public boost::static_visitor<>
{
public:
//These are just examples, the actions only need to be able to touch
// internal variables.
void operator()(TypeA & t)
{
m_runningSum += t.varA;
m_outStream << "TYPEA ACTION: " << t.varB << std::endl;
}
void operator()(TypeB & t)
{
m_charCount += t.varA.size();
m_outStream << t.varB << " ACTION " << t.varA << std::endl;
}
std::string emitWork(std::vector<MyVariantType> listOfVariants)
{
m_outStream.clear();
m_runningSum = 0;
m_charCount = 0;
BOOST_FOREACH(MyVariantType & v, listOfVariants)
{
boost::apply_visitor(*this, v);
}
return m_outStream.str();
}
protected:
int m_runningSum;
int m_charCount;
std::stringstream m_outStream;
}; //End class MyCommandVisitor
int main(int argc, char **argv)
{
TypeA ta;
ta.varA = 1;
ta.varB = 2;
TypeB tb;
tb.varA = "String1";
tb.varB = "String2";
std::vector<MyVariantType> listOfWork;
listOfWork.push_back(ta);
listOfWork.push_back(tb);
MyCommandVisitor myCV;
std::string result = myCV.emitWork(listOfWork);
std::cout << "Result:\n" << result << std::endl << std::endl;
return 0;
}
running on http://www.compileonline.com/compile_cpp11_online.php gives:
Compiling the source code....
$g++ -std=c++11 main.cpp -o demo -lm -pthread -lgmpxx -lgmp -lreadline 2>&1
Executing the program....
$demo
Result:
TYPEA ACTION: 2
String2 ACTION String1