[#BSLSTL_OPTIONAL_CONSTEXPR17]
= BSLSTL&lowbar;OPTIONAL&lowbar;CONSTEXPR17
:mrdocs:

`BSLSTL&lowbar;OPTIONAL&lowbar;CONSTEXPR17` controls whether constructors that are `constexpr` in C&plus;&plus;17 `std&colon;&colon;optional` are `constexpr` in `bsl&colon;&colon;optional` for&period;

== Synopsis

Declared in `&lt;bslstl&lowbar;optional&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
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#define BSLSTL&lowbar;OPTIONAL&lowbar;CONSTEXPR17

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