[#bsl-equal_to-0d]
= xref:bsl.adoc[bsl]::equal_to
:relfileprefix: ../
:mrdocs:

This `struct` defines a binary comparison functor applying `operator==` to two `VALUE_TYPE` objects. This class conforms to the C++11 standard specification of `std::equal_to` that does not require inheriting from `std::binary_function`. Note that this class is an empty POD type.

== Synopsis

Declared in `<bslstl_equalto.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class VALUE_TYPE = void>
struct equal_to;
----

== Type Aliases

[cols="1,4"]
|===
| Name| Description
| xref:bsl/equal_to-0d/first_argument_type.adoc[`first_argument_type`] 
| This `typedef` is an alias to the first argument type of `operator()`.
| xref:bsl/equal_to-0d/result_type.adoc[`result_type`] 
| This `typedef` is an alias to the result type of `operator()`.
| xref:bsl/equal_to-0d/second_argument_type.adoc[`second_argument_type`] 
| This `typedef` is an alias to the second argument type of `operator()`.
|===


== Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:bsl/equal_to-0d/operator_call.adoc[`operator()`] 
| Return `true` if the specified `lhs` compares equal to the specified `rhs` using the equality‐comparison operator, `lhs == rhs`.
|===


== Specializations

[cols="1,4"]
|===
| Name| Description
| xref:bsl/equal_to-09.adoc[`equal_to<void>`] 
| This `struct` defines a binary comparison functor applying `operator==` to two objects of (possibly different) types. Note that this class is an empty POD type.
|===



[.small]#Created with https://www.mrdocs.com[MrDocs]#