Support most overloaded member operators

HertzDevil commented 3 years ago

Wraps a lot of overloaded operators, provided they are defined inside a C++ class body. Some operators cannot be overloaded in Crystal (most notably the compound assignments), so they are renamed to normal methods containing ! in their names, see SPEC.md for the list of renamings. A few details have been left out for separate PRs in the future:

Non-member overloaded operators can be parsed, but the general case requires reopening core Crystal classes if the left operand is not a wrapped class, e.g. QVector3D multiplication.
operator= needs special care, due to its relation with copy constructors. It would probably be called assign!.
Although not limited to operators, operator[] usually has both non-const and const overloads and Bindgen will always select the former. This becomes a problem if they return entirely different types.
Wrappers do not gain <=> or include Comparable even if all 6 relational operators are defined. This is best done in the config, since each type may use its own comparison category. C++20's operator<=> is not supported either.
operator&() may conflict with the cookbook, so I left it out. (That said, the C++ wrappers should be using std::addressof instead.)

On Qt almost all the additions are relational operators. Some notable exceptions are QRect (union / intersection / margins), QStringList (its operator+ and operator<< are class members), and QDir (has operator[]).

Papierkorb commented 3 years ago

PR #100 ! :partying_face:

HertzDevil commented 3 years ago

Marking the support "partial" until I'm done with overloaded operators (non-member definitions are a must even if they only apply to left-hand operands of wrapped types)

Papierkorb commented 3 years ago

LGTM now :+1: ! Not much that's marked as TBD in the feature matrix anymore :eyes:

Papierkorb / bindgen

Support most overloaded member operators #100