Char * of std::vector<char> [duplicate]

This question already has answers here: Closed 11 years ago.

Possible Duplicate:

Is it possible to get the pointer the continous memory fragment in a std::vector<char> in C++?

How do I开发者_如何学C get char* from std::vector<char>, just like the function std::string.c_str()?

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Take the adress of the first element:

char * foo = &my_vec[0];

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To expand slightly on space_cowboy's answer...

You can do:

std::vector<char> vec;
vec.push_back('a');
vec.push_back('b');
vec.push_back('c');

char *arr = &vec[0];

However, if you were to now do a push_back...

vec.push_back('d');
arr; // This pointer has been possibly invalidated!
     // realloc could have been called on vec's memory.