std::expected<T,E>:: ~expected

Main template destructor

Destroys the contained value:

• If has_value() is true , destroys the expected value.
• Otherwise, destroys the unexpected value.

This destructor is trivial if std:: is_trivially_destructible_v < T > and std:: is_trivially_destructible_v < E > are both true .

void partial specialization destructor

If has_value() is false , destroys the unexpected value.

This destructor is trivial if std:: is_trivially_destructible_v < E > is true .

Example

#include <expected>
#include <print>
void info(auto name, int x)
{
    std::println("{} : {}", name, x);
}
struct Value
{
    int o{};
    ~Value() { info(__func__, o); }
};
struct Error
{
    int e{};
    ~Error() { info(__func__, e); }
};
int main()
{
    std::expected<Value, Error> e1{42};
    std::expected<Value, Error> e2{std::unexpect, 13};
    std::expected<void, Error> e3{std::unexpect, 37};
}

~Error : 37
~Error : 13
~Value : 42