hash_map::equal_range (STL/CLR)

Article
06/05/2017

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The latest version of this topic can be found at hash_map::equal_range (STL/CLR).

Finds range that matches a specified key.

Syntax

cliext::pair<iterator, iterator> equal_range(key_type key);

Parameters

key
Key value to search for.

Remarks

The member function returns a pair of iterators cliext::pair<iterator, iterator>( hash_map::lower_bound (STL/CLR)(``key``), hash_map::upper_bound (STL/CLR)(``key``)). You use it to determine the range of elements currently in the controlled sequence that match a specified key.

Example

// cliext_hash_map_equal_range.cpp   
// compile with: /clr   
#include <cliext/hash_map>   
  
typedef cliext::hash_map<wchar_t, int> Myhash_map;   
typedef Myhash_map::pair_iter_iter Pairii;   
int main()   
    {   
    Myhash_map c1;   
    c1.insert(Myhash_map::make_value(L'a', 1));   
    c1.insert(Myhash_map::make_value(L'b', 2));   
    c1.insert(Myhash_map::make_value(L'c', 3));   
  
// display contents " [a 1] [b 2] [c 3]"   
    for each (Myhash_map::value_type elem in c1)   
        System::Console::Write(" [{0} {1}]", elem->first, elem->second);   
    System::Console::WriteLine();   
  
// display results of failed search   
    Pairii pair1 = c1.equal_range(L'x');   
    System::Console::WriteLine("equal_range(L'x') empty = {0}",   
        pair1.first == pair1.second);   
  
// display results of successful search   
    pair1 = c1.equal_range(L'b');   
    for (; pair1.first != pair1.second; ++pair1.first)   
        System::Console::Write(" [{0} {1}]",   
            pair1.first->first, pair1.first->second);   
    System::Console::WriteLine();   
    return (0);   
    }

 [a 1] [b 2] [c 3]  
equal_range
(L'x') empty = True  
 [b 2]

Requirements

Header: <cliext/hash_map>

Namespace: cliext

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