Module#include

(::Module, *::Module arg0) -> self

include(module, ...) → self

static VALUE
rb_mod_include(int argc, VALUE *argv, VALUE module)
{
    int i;
    ID id_append_features, id_included;

    CONST_ID(id_append_features, "append_features");
    CONST_ID(id_included, "included");

    if (BUILTIN_TYPE(module) == T_MODULE && FL_TEST(module, RMODULE_IS_REFINEMENT)) {
        rb_raise(rb_eTypeError, "Refinement#include has been removed");
    }

    rb_check_arity(argc, 1, UNLIMITED_ARGUMENTS);
    for (i = 0; i < argc; i++) {
        Check_Type(argv[i], T_MODULE);
        if (FL_TEST(argv[i], RMODULE_IS_REFINEMENT)) {
            rb_raise(rb_eTypeError, "Cannot include refinement");
        }
    }
    while (argc--) {
        rb_funcall(argv[argc], id_append_features, 1, module);
        rb_funcall(argv[argc], id_included, 1, module);
    }
    return module;
}

Invokes Module.append_features on each parameter in reverse order.

Ruby version changes

3.0
- Module#include and Module#prepend now affect classes and modules that have already included or prepended the receiver, mirroring the behavior if the arguments were included in the receiver before the other modules and classes included or prepended the receiver. [Feature #9573]
  
  Example
```
class C; end
module M1; end
module M2; end
C.include M1
M1.include M2
p C.ancestors #=> [C, M1, M2, Object, Kernel, BasicObject]
```

See also #include? #freeze #extend_object #included also in 4.1 · 4.0 · 3.3 · 3.2 · 3.1 · 3.0

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