The type of an unsigned distance between two elements.

typedef T2 size_type;

The unsigned integer type describes an object that can represent the length of any controlled sequence. It is described here as a synonym for the implementation-defined type T2.


// std_tr1__unordered_map__unordered_map_size_type.cpp 
// compile with: /EHsc 
#include <unordered_map> 
#include <iostream> 
typedef std::unordered_map<char, int> Mymap; 
int main() 
    Mymap c1; 
    Mymap::size_type sz = c1.size(); 
    std::cout << "size == " << sz << std::endl; 
    return (0); 
size == 0

Header: <unordered_map>

Namespace: std

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