in the following example, gcc should report it is using a C++0x extension:


struct ValueInt
{
 ValueInt(int v = 0) : ValueLength(v) {}
 operator int () const { return ValueLength; }
private:
 int ValueLength;
};

int main(int, char *[])
{
 int *a = new int[ ValueInt(10) ];
 return 0;
}


According to the 98 standard:

implicitly calling the conversion function operator int() is a g++ and C++0x extension (see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#299) that is not in the current C++ standard.

Thanks !