std::bad_variant_access

class bad_variant_access : public std::exception

std::bad_variant_access is the type of the exception thrown in the following situations:

• std::get(std::variant) called with an index or type that does not match the currently active alternative
• std::visit called to visit a variant that is valueless_by_exception

Member functions

bad_variant_access() noexcept;

Example

#include <variant>
#include <iostream>
 
int main()
{
    std::variant<int, float> v;
    v = 12;
    try {
      std::get<float>(v);
    }
    catch(const std::bad_variant_access& e) {
        std::cout << e.what() << '\n';
    }
}

bad_variant_access

See also