Is there any use for local function declarations?

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The only use I can think of is to reduce the scope of function declarations:

int main()
{
    void doSomething();
    doSomething();
    return 0;
}

void otherFunc()
{
    doSomething();  // ERROR, doSomething() not in scope
}

void doSomething()
{
    ...
}

Of course, there are much better solutions to this. If you need to hide a function, you should really restructure your code by moving functions into separate modules so that the functions which need to call the function you want to hide are all in the same module. Then, you can make that function module-local by declaring it static (the C way) or by putting it inside an anonymous namespace (the C++ way).

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