Metafunction distinguishing iterators from fundamental types.

Synopsis

Declared in <bslstl_vector.h>

template<
    class BSLSTL_ITERATOR,
    bool BSLSTL_NOTSPECIALIZED = is_fundamental<BSLSTL_ITERATOR>::value>
struct Vector_DeduceIteratorCategory;

Description

This struct provides a primitive means to distinguish between iterator types and fundamental types, in order to dispatch to the correct implementation of a function template (or constructor template) passed two arguments of identical type. By default, it is assumed that any type that is not a fundamental type, as determined by the type trait bsl::is_fundamental, must be an iterator type. std::iterator_traits is updated in C++17 to provide a SFINAE‐friendly instantiation of the primary‐template for types that do not provide all of the nested typedef names, but we cannot portably rely on such a scheme yet.

Type Aliases

Name

Description

type

The deduced iterator category of BSLSTL_ITERATOR, or Nil for fundamental types.

Specializations

Name

Description

Vector_DeduceIteratorCategory<BSLSTL_ITERATOR, true>

Specialization of Vector_DeduceIteratorCategory for fundamental types.

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