I/O Formatting With Stringstream

I/O Formatting With Stringstream

The sprintf() function isn’t type-safe, it doesn’t support user-defined types and it’s a common source of buffer overflow bugs. In C++, there’s a better alternative to sprintf(), namely stringstream objects. The following function template accepts a value of any type and writes it into a user-supplied string s:

 #include using namespace std;template void string_fmt(string & s, const T & t){  ostringstream oss; // create a stream  oss << t; // insert t to buffer  s=oss.str(); // copy stream's string }

In the following example, the value 10.76 is written into the string s using the string_fmt() function template:

 string s;string_fmt(s,10.76);

The following cast_stream function template performs the opposite operation. It converts a variable of type in_value to a variable of type out_type. In the following example, cast_stream converts a string to a double:

 template out_type cast_stream(const in_value & t){ std::stringstream ss; ss << t; // first insert value out_type ret; // value will be converted to out_type ss >> ret; // write value to ret return ret;}string s=

See also  Monetize TikTok For Your Business

About Our Editorial Process

At DevX, we’re dedicated to tech entrepreneurship. Our team closely follows industry shifts, new products, AI breakthroughs, technology trends, and funding announcements. Articles undergo thorough editing to ensure accuracy and clarity, reflecting DevX’s style and supporting entrepreneurs in the tech sphere.

See our full editorial policy.

About Our Journalist