Return an optional containing a value constructed from the arguments.

Synopsis

Declared in <bslstl_optional.h>

template<
    class t_TYPE,
    class... t_ARGS>
bsl::optional<t_TYPE>
make_optional(
    std::allocator_arg_t allocatorArg,
    bsl::optional<t_TYPE>::allocator_type const& alloc,
    t_ARGS&&... args);

Description

Return an optional object containing a t_TYPE object created by invoking a bsl::optional allocator‐extended in_place_t constructor with the specified alloc as the allocator argument, and specified args as constructor arguments. Note that this function will fail to compile if t_TYPE doesn't use allocators.

Return Value

optional containing a t_TYPE constructed from args

Parameters

Name

Description

allocatorArg

tag selecting the allocator‐extended constructor

alloc

allocator used to supply memory for the optional

args

arguments forwarded to construct the contained value

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