Create an optional object having the value of the (template parameter) t_TYPE created in place using the specified args. Use the currently installed default allocator to supply memory. This constructor can be called in constant expressions only when t_TYPE is not allocator‐aware.

Synopsis

Declared in <bslstl_optional.h>

template<class... t_ARGS>
constexpr
explicit
optional(
    std::in_place_t,
    t_ARGS&&... args);

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