convert a char* to std::string

Question

I need to use std::string to store data retrieved by fgets(). To do this I need to convert fgets() char* output into an std::string to store in an array. How can this be done?

Answer 1

char* data;
std::string myString(data);

Answer 2

std::string has a constructor for this:

const char *s = "Hello, World!";
std::string str(s);

Just make sure that your char * isn't NULL, or else the behavior is undefined.

Answer 3

Pass it in through the constructur:

const char* dat = "my string!";
std::string my_string( dat );

You can use the function string.c_str() to go the other way:

std::string my_string("testing!");
const char* dat = my_string.c_str();

Answer 4

If you already know size of the char*, use this instead

char* data = ...;
int size = ...;
std::string myString(data, size);

This doesn't use strlen.

Answer 5

I need to use std::string to store data retrieved by fgets().

Why using fgets() when you are programming C++? Why not std::getline()?