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This question was written by a friend who luckily let me use it. It presents a very common pitfall of C++, regarding the syntax of declaration statements.

In the following code, what would be the type of b?

struct A {
    A (int i) {}
};

struct B {
    B (A a) {}
};

int main () {
    int i = 1;
    B b(A(i));
    return 0;
}

Hint: you will be surprised! Try printing inside B’s constructor.

§ 2 Responses to Problematic declaration syntax

• rmn says:

  07/09/2009 at 22:05

  A few good replies to this question can now be found on stackoverflow:
  http://stackoverflow.com/questions/1379932/trick-question-regarding-declaration-syntax-in-c

  Reply
• Stephen says:

  14/04/2010 at 22:56

  Eh, the most vaxine parse

  Reply