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c++pvm

(char**)0 in C ++

in PVM , there is a function call PVM_SPAWN, the head of this function is :

pvm_spawn( char *task, char **argv, int flag, char *where, int ntask, int *tids )

when the function is called, the second argument char** argv was passing as (char**)0

what (char**)0 means? is it a null pointer or a pointer which point to address 0 ??

Solution

  • In C++ 0 and NULL are interchangeable and the value 0 is compatible with all pointers (so there is actually no need to cast it to char **)