bsl::optional::optional

Create an optional object having the value of the (template parameter) t_TYPE created in place using the specified il and specified args.

Synopsis

Declared in <bslstl_optional.h>

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

Description

Create an optional object having the value of the (template parameter) t_TYPE created in place using the specified il and 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.

Parameters

Name

Description

inPlace

tag selecting in‐place construction of the contained

initializer list forwarded to construct the contained value

args

arguments forwarded to construct the contained value contained value value

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