Which C++ feature provides a concise way to define an unnamed function object?
auto square = [](int x)
{
return x * x;
};
cout << square(5);
Options
-
A.
Lambda expression
-
B.
Preprocessor directive
-
C.
Namespace
-
D.
More than one of the above
-
E.
None of the above
Correct Answer (Detailed Explanation is Below)
A.
Lambda expression
Detailed Explanation
Answer: (A) Lambda expression
A lambda expression provides a convenient way to create an unnamed function directly where it is needed.
In the example, [] introduces the lambda expression and (int x) specifies its parameter.
The lambda returns x * x. Therefore, calling square(5) produces 25.
