checking data availability before calling std::getline
c++, iostream
Solution
The `iostream` library doesn't support the concept of non-blocking I/O. I don't think there's anything in the C++ standard that does. Any good solution would likely be platform-specific. If you can use the POSIX libraries, you might look into `select`. It's usually used for networking stuff, but it'll work just fine if you pass it the file descriptor for stdin.
Problem
I would like to read some data from a stream I have using `std::getline`. Below a sample using the `std::cin`. ``` std::string line; std::getline( std::cin, line ); ``` This is a blocking function i.e. if there is no data or line to read it blocks execution. Do you know if exists a function for checking data availability before calling `std::getline`? I don't want to block. How can I check whether the stream buffer is full of data valid for a successful call to `std::getline`? Whatever looks like the code below ``` if( dataAvailableInStream() ) { std::string line; std::getline( std::cin, line ); } ```