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I have a function that uses basic_istream as an argument, and I have a std::string with the data I need to pass it. How do I do that?
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Using the stoi() function The stoi() function converts a string data to an integer type by passing the string as a parameter to return an integer value. The stoi() function contains an str argument. The str string is passed inside the stoi() function to convert string data into an integer value.
Other ways to read a std::istreamTo read a line of input, try the getline() function. For this, you need #include <string> in addition to #include <iostream> . To read a single char: use the get() method. To read a large block of characters, either use get() with a char[] as the argument, or use read() .
In C++, the stoi() function converts a string to an integer value. The function is shorthand for “string to integer,” and C++ programmers use it to parse integers out of strings. The stoi() function is relatively new, as it was only added to the language as of its latest revision (C++11) in 2011.
There is no functionality difference between string and std::string because they're the same type.
You can put the string data into a stream:
std::string x;
std::stringstream ss(x); // put string into stream
function_taking_stream(ss);
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