hash_set::count (STL/CLR)

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Finds the number of elements matching a specified key.

Syntax

size_type count(key_type key);

Parameters

key
Key value to search for.

Remarks

The member function returns the number of elements in the controlled sequence that have equivalent ordering with key. You use it to determine the number of elements currently in the controlled sequence that match a specified key.

Example

// cliext_hash_set_count.cpp   
// compile with: /clr   
#include <cliext/hash_set>   
  
typedef cliext::hash_set<wchar_t> Myhash_set;   
int main()   
    {   
    Myhash_set c1;   
    c1.insert(L'a');   
    c1.insert(L'b');   
    c1.insert(L'c');   
  
// display initial contents " a b c"   
    for each (wchar_t elem in c1)   
        System::Console::Write(" {0}", elem);   
    System::Console::WriteLine();   
  
    System::Console::WriteLine("count(L'A') = {0}", c1.count(L'A'));   
    System::Console::WriteLine("count(L'b') = {0}", c1.count(L'b'));   
    System::Console::WriteLine("count(L'C') = {0}", c1.count(L'C'));   
    return (0);   
    }

 a b c  
count
(L'A') = 0  
count
(L'b') = 1  
count
(L'C') = 0

Requirements

Header: <cliext/hash_set>

Namespace: cliext

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