Question

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Is there a use for function declarations inside functions?

I know that inside function we can declare a function. What is the use of it? Can you please bring a simple example?

Answer 1

There is little value to declaring a function inside a function, unless you intend on defining it later and only having it available to that function- i.e., the function declaration is encapsulated.

int main() {
    void foo();
    foo();
}
void some_other_func() {
    foo(); // ERROR
}
void foo() {
}

But that’s it. In comparison to triggering the Most Vexing Parse, this is an extremely limited benefit at best.