How to pass vector of string to foo(char const *const *const)?

Since foo only takes a pointer, my wild guess is that it requires a NULL-terminated array. Allocate an extra element for aR and assign NULL to it.

Well it's seems right to me. C_str create a null terminated array of char that is constant until the next non-const string operation. You store the c_str pointers in a const char* array.

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