[#bsl-basic_string-074]
= xref:bsl.adoc[bsl]::xref:bsl/basic_string-0faf.adoc[basic_string<CHAR_TYPE, CHAR_TRAITS, ALLOCATOR>]
:relfileprefix: ../
:mrdocs:

Deduce the template parameters `CHAR_TYPE`, `TRAITS`, and `ALLOCATOR` from the corresponding template parameters of the `bsl::basic_string` passed to the constructor of `basic_string`. This deduction guide does not participate unless the specified `ALLOC` is convertible to `ALLOCATOR`.

== Synopsis

Declared in `<bslstl_string.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class CHAR_TYPE,
    class CHAR_TRAITS,
    class ALLOCATOR,
    class ALLOC>
requires bsl::is_convertible_v<ALLOC, ALLOCATOR>
xref:bsl/basic_string-0faf.adoc[basic_string<CHAR_TYPE, CHAR_TRAITS, ALLOCATOR>](
    xref:bsl/basic_string-0faf.adoc[basic_string<CHAR_TYPE, CHAR_TRAITS, ALLOCATOR>],
    ALLOC) -> xref:bsl/basic_string-0faf.adoc[basic_string<CHAR_TYPE, CHAR_TRAITS, ALLOCATOR>];
----


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