[#bsl-variant-valueless_by_exception]
= xref:bsl.adoc[bsl]::xref:bsl/variant.adoc[variant]::valueless_by_exception
:relfileprefix: ../../
:mrdocs:

Return `false` if there is an alternative object currently managed by this `variant` object, and `true` otherwise. A `variant` object can become valueless by exception if the creation of an alternative object exits via an exception, or if it is copied or assigned from another `variant` object that is valueless by exception. This method differs from the standard in the following way: * `constexpr` is not implemented This is because no constructors are currently constexpr and there is no way to test the constexpr property of this function.

== Synopsis

Declared in `<bslstl_variant.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
bool
valueless_by_exception() const noexcept;
----


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