Hi,
Compiler instantiates the second Binary visitor instead of the first one even
though the template parameters are same.
regards,
Prashant
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struct add_tuple_visitor: public boost::static_visitor<bool> {
// Expected this to be instantiated by the compiler.
// 1.
template <typename T>
bool operator()( T & lhs, const T & rhs) const
{
lhs += rhs ;
return true;
}
// Compiler considers this as an appropriate fit ..
// 2.
template
bool operator()( T & lhs, const U & rhs) const
{
lhs += rhs ;
return true;
}
};
struct agg_calc {
public:
template <typename T>
bool operator () (
T & lhs,
const T & rhs
) const {
for(
std::size_t curr_oper = 0;
curr_oper < num_operations;
++v
) {
switch(
agg_operators.at(curr_oper)
) {
case '+' :
boost::apply_visitor(
agg_visitor,
lhs.at(curr_oper), //vector of variants
rhs.at(curr_oper) //vector of variants
);
break;
default:
break;
};
} // for loop
return true;
}
//Store the aggregation operators
agg_types agg_operators;
std::size_t num_operations;
// Create visitor objects for delayed form of apply_visitor
add_tuple_visitor agg_visitor;
};
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