I'm using boost::variant in the following manner
struct Visitor : boost::static_visitor<>
{
void operator()(int &i) const
{
i = 1;
}
};
boost::variant var = 0;
boost::apply_visitor(Visitor(), 0);
I'm trying to get the program to compile if the variant takes on the guise of an int (because I've implemented void operator()(int &i) const, but not compile if I make the variant take the guise of a char e.g. boost::variant var = 'a'; because I've not implemented the void operator()(char &c) const
Can anyone think of a way of doing this, maybe using SFINAE (Substitution Failure Is Not An Error)
I'm thinking of doing something along the lines of :
template <typename T>
struct SetObj;
template <>
struct SetObj<int>
{
void operator()(int &obj) const
{
obj = 1;
}
}
struct Visitor : boost::static_visitor<>
{
template <typename T>
void operator()(T& obj) const
{
SetObj<T>()(obj);
}
};
But not sure how to take it to the next level to get the desired behaviour.
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