A lambda expression is a shorthand notation for creating an unnamed callable object (also called a closure, or an anonymous function). A lambda can "capture" variables from its surrounding scope by value or by reference, allowing the body of the lambda to access or modify those variables without having to pass them as parameters. Unlike regular functions, lambdas are typically written in-line, combining the reusability of functions with direct access to local context. The lambda retains captured variables' state (for captures by value) or dynamically references them (for captures by reference), making lambdas ideal for short, context-dependent operations like custom comparisons, filters, or event handlers.
Example:
bool is_even(int x) {
return x % 2 == 0;
}
int main() {