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hash_map::hash_map

Note Note

This API is obsolete. The alternative is unordered_map Class.

Constructs a hash_map that is empty or is a copy of all or part of some other hash_map.

hash_map( );
explicit hash_map(
    const Traits& Comp
);
hash_map(
    const Traits& Comp,
    const Allocator& Al
);
hash_map(
    const hash_map& Right
);
hash_map(
    hash_map&& Right
);
hash_map(
     initializer_list<Type> IList
);
hash_map(
     initializer_list<Type> IList,
     const key_compare& Comp
);
hash_map(
     initializer_list<Type> IList,
     const key_compare& Comp, 
     const allocator_type& Al
);
template<class InputIterator>
   hash_map(
      InputIterator First,
      InputIterator Last
   );
template<class InputIterator>
   hash_map(
      InputIterator First,
      InputIterator Last,
      const Traits& Comp
   );
template<class InputIterator>
   hash_map(
      InputIterator First,
      InputIterator Last,
      const Traits& Comp,
      const Allocator& Al

Parameter

Description

Al

The storage allocator class to be used for this hash_map object, which defaults to Allocator.

Comp

The comparison function of type const Traits used to order the elements in the hash_map, which defaults to hash_compare.

Right

The hash_map of which the constructed map is to be a copy.

First

The position of the first element in the range of elements to be copied.

Last

The position of the first element beyond the range of elements to be copied.

IList

The initializer_list

All constructors store a type of allocator object that manages memory storage for the hash_map and can later be returned by calling get_allocator. The allocator parameter is often omitted in the class declarations and preprocessing macros used to substitute alternative allocators.

All constructors initialize their hash_map.

All constructors store a function object of type Traits that is used to establish an order among the keys of the hash_map and that can later be returned by calling key_comp.

The first three constructors specify an empty initial hash_map, in addition, the second specifies the type of comparison function (Comp) to be used in establishing the order of the elements and the third explicitly specifies the allocator type (Al) to be used. The keyword explicit suppresses certain kinds of automatic type conversion.

The fourth constructor specifies a copy of the hash_map Right.

The next three constructors copy the range [First, Last) of a hash_map with increasing explicitness in specifying the type of comparison function of class Traits and allocator.

The last constructor moves the hash_map Right.

Header: <hash_map>

Namespace: stdext

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