62e8601919
git-subtree-dir: third_party/variant git-subtree-split: b5850212f16efeb409a112edb1e719d5f5edb604
21 lines
384 B
C++
21 lines
384 B
C++
#include <boost/variant.hpp>
|
|
|
|
#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;
|
|
}
|