Reference
C Library
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STL Containers
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comparison operators
map::map
map::~map
member functions:
map::begin
map::clear
map::count
map::empty
map::end
map::equal_range
map::erase
map::find
map::get_allocator
map::insert
map::key_comp
map::lower_bound
map::max_size
map::operator=
map::operator[]
map::rbegin
map::rend
map::size
map::swap
map::upper_bound
map::value_comp


map::size

public member function
size_type size() const;

Return container size

Returns the number of elements in the container.

Parameters

none

Return Value

The number of elements that conform the map's content.

Member type size_type is an unsigned integral type.

Example

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// map::size
#include <iostream>
#include <map>
using namespace std;
int main ()
{
  map<char,int> mymap;
  mymap['a']=101;
  mymap['b']=202;
  mymap['c']=302;
  cout << "mymap.size() is " << (int) mymap.size() << endl;
  return 0;
}


Output:
mymap.size() is 3

Complexity

Constant.

See also

map::max_size Return maximum size (public member function)
map::empty Test whether container is empty (public member function)