M1 is also readable, then the read operations will return the corresponding values of M1.
The Key and Value are inherited from M1. The Key and Value of M2 must be convertible from those of M1.
#include <lemon/maps.h>

| Public Member Functions | |
| ForkWriteMap (M1 &_m1, M2 &_m2) | |
| Constructor. | |
| Value | operator[] (Key k) const | 
|  | |
| void | set (Key k, const Value &v) | 
|  | |
| Related Functions | |
| (Note that these are not member functions.) | |
| template<typename M1 , typename M2 > | |
| ForkWriteMap< M1, M2 > | forkMap (M1 &m1, M2 &m2) | 
| Returns a ForkWriteMapclass. | |
 1.5.9
 1.5.9