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

Meta‐function for detecting implicit convertibility between types.

== Synopsis

Declared in `<bslmf_isconvertible.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class t_FROM_TYPE,
    class t_TO_TYPE>
struct is_convertible
    : xref:bsl/integral_constant-02.adoc[bsl::integral_constant<bool, ::std::is_convertible<typename BloombergLP::bslmf::IsConvertible_CheckComplete<t_FROM_TYPE>::type, typename BloombergLP::bslmf::IsConvertible_CheckComplete<t_TO_TYPE>::type>::value>]
----

== Description

This `struct` template implements the `is_convertible` meta‐function defined in the C++11 standard to determine whether the (template parameter) `t_FROM_TYPE` is implicitly convertible to the (template parameter) `t_TO_TYPE`.

== Base Classes

[cols="1,4"]
|===
| Name| Description
| `xref:bsl/integral_constant-02.adoc[bsl::integral_constant<bool, ::std::is_convertible<typename BloombergLP::bslmf::IsConvertible_CheckComplete<t_FROM_TYPE>::type, typename BloombergLP::bslmf::IsConvertible_CheckComplete<t_TO_TYPE>::type>::value>]`
| Metafunction representing a compile‐time constant of the specified (template parameter) `t_TYPE` with the specified (template parameter) `t_VALUE`.
|===

== Type Aliases

[cols="1,4"]
|===
| Name| Description
| xref:bsl/integral_constant-02/type.adoc[`type`] 
| Alias for this `integral_constant` specialization.
| xref:bsl/integral_constant-02/value_type.adoc[`value_type`] 
| Alias for the (template parameter) `t_TYPE`.
|===


== Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:bsl/integral_constant-02/operator_call.adoc[`operator()`] 
| Return a copy of the template argument `t_VALUE`.
| xref:bsl/integral_constant-02/2conversion.adoc[`operator t_TYPE`] 
| Return a copy of the template argument `t_VALUE`.
|===


== Static Data Members

[cols="1,4"]
|===
| Name| Description
| xref:bsl/integral_constant-02/value.adoc[`value`] 
| The compile‐time constant value of this metafunction.
|===


== Derived Classes

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bslstl/IsConvertibleToCString-04.adoc[`IsConvertibleToCString`] 
| This `struct` template implements a meta‐function to determine if the (template parameter) `t_TYPE` is convertible to `const t_CHAR_TYPE *`.
| xref:BloombergLP/bslstl/IsConvertibleToStringView-02.adoc[`IsConvertibleToStringView`] 
| Meta‐function for detecting types convertible to a string view.
| xref:BloombergLP/bslma/UsesBslmaAllocator-0240.adoc[`UsesBslmaAllocator<bsl::basic_string<CHAR_TYPE, CHAR_TRAITS, ALLOC>>`] 
| Trait indicating `basic_string` uses `bslma` allocators.
| xref:BloombergLP/bslma/UsesBslmaAllocator-02f.adoc[`UsesBslmaAllocator<bsl::map<KEY, VALUE, COMPARATOR, ALLOCATOR>>`] 
| Trait indicating `bsl::map` uses `bslma` allocators when `ALLOCATOR` allows.
| xref:BloombergLP/bslma/UsesBslmaAllocator-054.adoc[`UsesBslmaAllocator<bsl::hash_set<_Value, _HashFcn, _EqualKey, _Alloc>>`] 
| Trait indicating `hash_set` uses `bslma` allocators when `_Alloc` allows.
| xref:BloombergLP/bslma/UsesBslmaAllocator-0573.adoc[`UsesBslmaAllocator<bsl::hash_multimap<_Key, _Tp, _HashFcn, _EqualKey, _Alloc>>`] 
| Trait indicating `hash_multimap` uses `bslma` allocators when `_Alloc` allows.
| xref:BloombergLP/bslma/UsesBslmaAllocator-072.adoc[`UsesBslmaAllocator<bsl::list<VALUE, ALLOCATOR>>`] 
| Trait indicating `bsl::list` uses `bslma` allocators when `ALLOCATOR` allows.
| xref:BloombergLP/bslma/UsesBslmaAllocator-0877.adoc[`UsesBslmaAllocator<bsl::set<KEY, COMPARATOR, ALLOCATOR>>`] 
| Trait indicating `bsl::set` uses `bslma` allocators when `ALLOCATOR` allows.
| xref:BloombergLP/bslma/UsesBslmaAllocator-08b.adoc[`UsesBslmaAllocator<bsl::deque<VALUE_TYPE, ALLOCATOR>>`] 
| Trait indicating `deque` uses `bslma` allocators when `ALLOCATOR` allows.
| xref:BloombergLP/bslma/UsesBslmaAllocator-08c.adoc[`UsesBslmaAllocator<bsl::multimap<KEY, VALUE, COMPARATOR, ALLOCATOR>>`] 
| Trait indicating `bsl::multimap` uses `bslma` allocators when `ALLOCATOR` allows.
| xref:BloombergLP/bslma/UsesBslmaAllocator-095.adoc[`UsesBslmaAllocator<bsl::hash_multiset<_Value, _HashFcn, _EqualKey, _Alloc>>`] 
| Trait indicating `hash_multiset` uses `bslma` allocators when `_Alloc` allows.
| xref:BloombergLP/bslma/UsesBslmaAllocator-0ba.adoc[`UsesBslmaAllocator<bsl::hash_map<_Key, _Tp, _HashFcn, _EqualKey, _Alloc>>`] 
| Trait indicating `hash_map` uses `bslma` allocators when `_Alloc` allows.
| xref:BloombergLP/bslma/UsesBslmaAllocator-0bce.adoc[`UsesBslmaAllocator<bsl::multiset<KEY, COMPARATOR, ALLOCATOR>>`] 
| Trait indicating `bsl::multiset` uses `bslma` allocators.
|===


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