What is short-circuit evaluation in C++?

Short-circuit evaluation is a behavior of logical operators in C++ where the second part of an expression is evaluated only if it is necessary to determine the final result.

For example, in an expression using the logical OR operator, if the left-hand side already evaluates to true, the right-hand side is never executed because the entire expression must already be true.

if (is_admin || hasPermission())

{