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

Efficiently exchange the value of this object with the value of the specified `other` object. This method provides the no‐throw exception‐safety guarantee if the two swapped objects contain the same alternative and if that alternative `t_TYPE` provides that guarantee. If `*this` and `other` do not have the same active alternative and this method exits via an exception, either or both `variant` objects may be left in a valueless state or with an contained value in a moved‐from state. The behavior is undefined unless `*this` has the same allocator as `other`. All alternatives shall be move constructible and swappable. For simplicity of implementation, this method differs from the standard in the following ways: * `constexpr` is not implemented * `noexcept` specification is not implemented

== Synopsis

Declared in `<bslstl_variant.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void
swap(xref:bsl/variant.adoc[variant]& other);
----


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