Metafunction to determine whether the specified template parameter TYPE meets the minimum requirements for a C++11 allocator. Specifically, this struct is derived from true_type if TYPE has a nested value_type and supports the operation a.allocate(bytes), where a has type TYPE and bytes has type allocator_traits<TYPE>::size_type; otherwise it is derived from false_type.
Declared in <bslma_isstdallocator.h>
template<class TYPE>
struct IsStdAllocator
: /* implementation-defined */::type| Name | Description |
|---|---|
/* implementation-defined */::type |
| Name | Description |
|---|---|
IsStdAllocator<bsl::allocator<void>> | bsl::allocator<void> is not an allocator type, even though all other instantiations are allocator types. |
IsStdAllocator<std::allocator<void>> | std::allocator<void> is not an allocator type, even though all other specializations are allocator types. |
IsStdAllocator<bsl::allocator<TYPE>> | A bsl::allocator inherits its allocate method from a base class, which causes IsStdAllocator to fail the auto-detected it. |
IsStdAllocator<std::allocator<TYPE>> | Specialization for std::allocator. |
IsStdAllocator<bsl::polymorphic_allocator<TYPE>> | Declare polymorphic_allocator as a C++11 compatible allocator for all versions of C++. |
IsStdAllocator<TYPE&> | Specialization for lvalue reference types. |
IsStdAllocator<TYPE&&> | Specialization for rvalue reference types. |