Code Reckons

Source code

#include <string>
#include <concepts>
#include <iostream>

using namespace std::meta;

consteval void property(class_builder& b, type type, std::string name) {
    auto member_name = identifier{("m_" + name).c_str()};
    append_field(b, member_name, type);
    
    // getter
    {
        method_prototype mp;
        object_type(mp, make_const(decl_of(b)));
        return_type(mp, make_lvalue_reference(make_const(type)));

append_method(b, identifier{("get_" + name).c_str()}, mp,
            [member_name](method_builder& b){
                append_return(b,
                    make_field_expr(
                        make_deref_expr(make_this_expr(b)),
                        member_name));
            });
    }

// setter
    {
        method_prototype mp;
        append_parameter(mp, "x", make_lvalue_reference(make_const(type)));
        object_type(mp, decl_of(b));
        return_type(mp, ^void);

append_method(b, identifier{("set_" + name).c_str()}, mp,
            [member_name](method_builder& b){
                append_expr(b,
                    make_operator_expr(
                        operator_kind::assign,
                        make_field_expr(make_deref_expr(make_this_expr(b)), member_name),
                        make_decl_ref_expr(parameters(decl_of(b))[1])
                        ));
            });        
    }
}

struct Book {
    % property(^std::string, "author");
    % property(^std::string, "title");
};

int main() {
    Book b;
    b.set_title("The Hitchhiker's Guide to the Galaxy");
    b.set_author("Douglas Adams");

std::cout << b.get_title() << " by " << b.get_author() << '\n';
}