ilpropheta/Writing into a std::string by exploiting C++17 non-const string::data().cpp Secret

Last active June 23, 2016 19:42

Star 0 You must be signed in to star a gist
Fork 0 You must be signed in to fork a gist

Learn more about clone URLs
Clone this repository at <script src="https://gist.github.com/ilpropheta/404d346da720a364aabc29bcbeb5ae7b.js"></script>
Save ilpropheta/404d346da720a364aabc29bcbeb5ae7b to your computer and use it in GitHub Desktop.

Download ZIP

Raw

Writing into a std::string by exploiting C++17 non-const string::data().cpp

	string res(char_needed, 0);
	sprintf(res.data(), "%d", intNumber);

pepsiman commented Jun 5, 2016

I think you'd need to resize afterwards:

string res(char_needed); res.resize(sprintf(res.data(), "%d", intNumber));

Author

ilpropheta commented Jun 23, 2016

Yeah, it's definitely better, even if res is actually filled with zeros so successive operations on the string should take this information into account.

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment