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c++arrayspointers
Alex Fateev
Alex Fateev

Reputation: 53

Right way to define pointer to the string array(C++)?


Can I define pointer to a string array like this?

std::string* str_arr_p[];

Or I need to set the size of the array?

P.S.: Is there any difference between std::string* str_arr_p[n]; and
std::string (*str_arr_p)[n];

Upvotes: 0

Views: 86

Answers (2)

Amir Kirsh
Amir Kirsh

Reputation: 13752

Can I initialize pointer to a string array like this? std::string* str_arr_p[]; Or I need to set the size of the array?

No you can't. Try it and see that you get compilation error.

Is there any difference between std::string* str_arr_p[n]; and std::string (*str_arr_p)[n];

Yes there is. The first is an array of n pointers to std::string, the second is a single pointer to an array of std::string of size n.

Note that both are uninitialized (if not declared as global or static), i.e. both point or hold arbitrary address(es). The first holds n arbitrary addresses that can be initialized separately with a valid address or nullptr for each of the n pointers in the array. The second is a single address that need to be initialized with an address of an std::string array which has the exact size n.

Upvotes: 1

user
user

Reputation: 944

std::string* str_arr_p[n];

is an array of pointers to std::string. std::string (*str_arr_p)[n]; here str_arr_p is a pointer to an array of n std::string

std::string* str_arr_p[]; this is a definition, you don't initialize anything. std::string* str_arr_p[] = new std::string* [x]; heap allocated or std::string* str_arr_p[50]; Stack allocated, this will be destroyed when function ends

Upvotes: 1

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