的char * :: vector的<char>

Question

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

我如何從std::vector<char>char*，就像函數std::string.c_str()？

Answer 1

採取的第一個元素的地址：

char * foo = &my_vec[0]; 

Answer 2

要在space_cowboy的回答略有擴大......

你可以這樣做：

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

char *arr = &vec[0]; 

但是，如果你現在是到做一個push_back ...

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