template <typename TKey, typename TValue>
struct resetter : public std::unary_function<std::pair<TKey, TValue> > {
    TValue const value;

    public resetter(value const& v) : value(v) { }

    public void operator ()(std::pair<TKey, TValue>& v) {
        v.second = value;
    }
};

for_each(map.begin(), map.end(), resetter<Key, Value>(value));

map <int,string> myMap;
for( int k=0;k<1000;k++)
  myMap.insert(pair<int,string>(k,string("")));

map<string,int> m;
insert( m )( "Bar", 1 )( "Foo", 2 );

map<int,int> next = map_list_of(1,2)(2,3)(3,4)(4,5)(5,6);

pair<int,string> init( 0,string(""));
multimap <int,string> myMap = repeat(1000,init);

map <int,string> myMap;

struct nextkey
{
   int start;
   nextkey( s ) : start( s ) {}
   pair<int,string> operator () ()
{
   return pair<int,string>(start++,string(""));
}
};

myMap = repeat_fun(1000,nextkey(0));

map <int,string> myMap;
for( int k=0;k<1000;k++)
  myMap.insert(pair<int,string>(k,string("")));

#include <boost/range/adaptor/map.hpp>
auto my_values = boost::adaptors::values(my_map);
std::fill(my_values.begin(), my_values.end(), 123);