884c998622
git-subtree-dir: third_party/variant git-subtree-split: 24dcab23c4f70e54838e4a32a228aba8045ae17b
20 lines
403 B
C++
20 lines
403 B
C++
#include <boost/variant.hpp>
|
|
#include <cstdint>
|
|
#include <stdexcept>
|
|
|
|
struct check : boost::static_visitor<>
|
|
{
|
|
template <typename T>
|
|
void operator() (T const& val) const
|
|
{
|
|
if (val != 0) throw std::runtime_error("invalid");
|
|
}
|
|
};
|
|
|
|
int main() {
|
|
typedef boost::variant<bool, int, double> variant_type;
|
|
variant_type v(0);
|
|
boost::apply_visitor(check(), v);
|
|
return 0;
|
|
}
|