Supports the default argument whose value is a reference, for example:
class AAA
{
public:
    static const BBBB = 100;
    void foo(int arg1 = BBBB);    // Support this default argument which is not integer argument like 'int arg1 = 100; '
}
Merge pull request #19 from dumganhar/support-reference-default-argument

Supports the default argument whose value is a reference, for example:
class AAA
{
public:
static const BBBB = 100;
void foo(int arg1 = BBBB); // Support this default argument which is not integer argument like 'int arg1 = 100; '
}