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