hash_map::difference_type (STL/CLR)

 

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The types of a signed distance between two elements.

Syntax

typedef int difference_type;  

Remarks

The type describes a possibly negative element count.

Example

// cliext_hash_map_difference_type.cpp   
// compile with: /clr   
#include <cliext/hash_map>   
  
typedef cliext::hash_map<wchar_t, int> Myhash_map;   
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();   
  
// compute positive difference   
    Myhash_map::difference_type diff = 0;   
    for (Myhash_map::iterator it = c1.begin(); it != c1.end(); ++it)   
        ++diff;   
    System::Console::WriteLine("end()-begin() = {0}", diff);   
  
// compute negative difference   
    diff = 0;   
    for (Myhash_map::iterator it = c1.end(); it != c1.begin(); --it)   
        --diff;   
    System::Console::WriteLine("begin()-end() = {0}", diff);   
    return (0);   
    }  
  

 [a 1] [b 2] [c 3]  
end
()-begin
() = 3  
begin
()-end
() = -3  

Requirements

Header: <cliext/hash_map>

Namespace: cliext

See Also

hash_map (STL/CLR)
hash_map::size_type (STL/CLR)