1) Index-based non-throwing accessor: If pv is not a null pointer and pv->index() == I, returns a pointer to the value stored in the variant pointed to by pv. Otherwise, returns a null pointer value. The call is ill-formed if I is not a valid index in the variant.
2) Type-based non-throwing accessor: Equivalent to (1) with I being the zero-based index of T in Types.... The call is ill-formed if T is not a unique element of Types....
Pointer to the value stored in the pointed-to variant or null pointer on error.
[edit] Example#include <iostream>
#include <variant>
int main()
{
auto check_value = [](const std::variant<int, float>& v)
{
if (const int* pval = std::get_if<int>(&v))
std::cout << "variant value: " << *pval << '\n';
else
std::cout << "failed to get value!" << '\n';
};
std::variant<int, float> v{12}, w{3.f};
check_value(v);
check_value(w);
}
Output:
variant value: 12 failed to get value![edit] See also reads the value of the variant given the index or the type (if the type is unique), throws on error
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