# std::variant<Types...>::~variant

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< cpp‎ | utility‎ | variant

~variant(); |  | (since C++17) (constexpr since C++20)

If `valueless_by_exception()` is true, does nothing. Otherwise, destroys the currently contained object.

This destructor is trivial if std::is_trivially_destructible_v <T_i> is true for all `T_i` in `Types...`.

### Notes

Feature-test macro | Value | Std | Feature
--- | --- | --- | ---
`__cpp_lib_variant` | `202106L` | (C++20) (DR) | Fully constexpr `std::variant`

### Example

Run this code

    #include <cstdio>
    #include <variant>

    int main()
    {
        struct X { ~X() { puts("X::~X();"); } };
        struct Y { ~Y() { puts("Y::~Y();"); } };

        {
            puts("entering block #1");
            std::variant<X,Y> var;
            puts("leaving block #1");
        }

        {
            puts("entering block #2");
            std::variant<X,Y> var{ std::in_place_index_t<1>{} }; // constructs var(Y)
            puts("leaving block #2");
        }
    }

Output:

    entering block #1
    leaving block #1
    X::~X();
    entering block #2
    leaving block #2
    Y::~Y();

### Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

DR | Applied to | Behavior as published | Correct behavior
--- | --- | --- | ---
P2231R1 | C++20 | the destructor was not constexpr while non-trivial destructors can be constexpr in C++20 | made constexpr

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