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Getline

As explained in Learn C++ by Example

std::getline is a C++ standard library function that extracts characters from an input stream into a string until a delimiter is encountered.

std::getline reads an entire line from an input stream into a std::string, preserving spaces that operator>> would leave behind. It collects characters until the line ends or a delimiter is reached. section 3.1.2

Read a complete response

Use std::getline when a response may contain spaces, such as “Hello, World!”: std::string in; std::getline(std::cin, in); The resulting string contains the complete line. section 3.1.2

How Learn C++ by Example covers it

How deep it goes
Explains whitespace preservation and line collection, but defers detailed stream parsing and error handling to surrounding input code.
Examples
Uses a “Hello, World!” response and a minimal std::cin-to-std::string listing to contrast whole-line and token input.
What it assumes
Assumes basic std::cin and std::string usage while teaching why token extraction cannot capture whitespace-containing lines.
What you can do after
Apply it via std::getline to capture complete user responses, including spaces, for comparison or conversion.
How it connects
Connects std::getline with std::cin, std::string, input streams, and numeric parsing through std::istringstream.
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Related concepts

This explainer was generated by Manning's knowledge graph from the text of Learn C++ by Example. The section links point to the parts of the book it draws on.