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#ifndef RBIMPL_METHOD_H /*-*-C++-*-vi:se ft=cpp:*/
#define RBIMPL_METHOD_H
/**
* @file
* @author Ruby developers <ruby-core@ruby-lang.org>
* @copyright This file is a part of the programming language Ruby.
* Permission is hereby granted, to either redistribute and/or
* modify this file, provided that the conditions mentioned in the
* file COPYING are met. Consult the file for details.
* @warning Symbols prefixed with either `RBIMPL` or `rbimpl` are
* implementation details. Don't take them as canon. They could
* rapidly appear then vanish. The name (path) of this header file
* is also an implementation detail. Do not expect it to persist
* at the place it is now. Developers are free to move it anywhere
* anytime at will.
* @note To ruby-core: remember that this header can be possibly
* recursively included from extension libraries written in C++.
* Do not expect for instance `__VA_ARGS__` is always available.
* We assume C99 for ruby itself but we don't assume languages of
* extension libraries. They could be written in C++98.
* @brief Creation and modification of Ruby methods.
*/
#include "ruby/internal/attr/nonnull.h"
#include "ruby/internal/dllexport.h"
#include "ruby/internal/value.h"
#include "ruby/backward/2/stdarg.h"
/**
* @defgroup defmethod Defining methods
*
* There are some APIs to define a method from C.
* These API takes a C function as a method body.
*
* ### Method body functions
*
* Method body functions must return a VALUE and
* can be one of the following form:
*
* #### Fixed number of parameters
*
* This form is a normal C function, excepting it takes
* a receiver object as the first argument.
*
* ```CXX
* static VALUE my_method(VALUE self, VALUE x, VALUE y);
* ```
*
* #### argc and argv style
*
* This form takes three parameters: argc, argv and self.
* self is the receiver. argc is the number of arguments.
* argv is a pointer to an array of the arguments.
*
* ```CXX
* static VALUE my_method(int argc, VALUE *argv, VALUE self);
* ```
*
* #### Ruby array style
*
* This form takes two parameters: self and args.
* self is the receiver. args is an Array object which
* contains the arguments.
*
* ```CXX
* static VALUE my_method(VALUE self, VALUE args);
* ```
*
* ### Number of parameters
*
* Method defining APIs takes the number of parameters which the
* method will takes. This number is called argc.
* argc can be:
*
* - Zero or positive number.
* This means the method body function takes a fixed number of parameters.
*
* - `-1`.
* This means the method body function is "argc and argv" style.
*
* - `-2`.
* This means the method body function is "self and args" style.
*
* @{
*/
RBIMPL_SYMBOL_EXPORT_BEGIN()
RBIMPL_ATTR_NONNULL(())
/**
* Defines a method.
*
* @param[out] klass A module or a class.
* @param[in] mid Name of the function.
* @param[in] func The method body.
* @param[in] arity The number of parameters. See @ref defmethod.
* @note There are in fact 18 different prototypes for func.
* @see ::ruby::backward::cxxanyargs::define_method::rb_define_method
*/
void rb_define_method(VALUE klass, const char *mid, VALUE (*func)(ANYARGS), int arity);
RBIMPL_ATTR_NONNULL(())
/**
* Defines a module function for a module.
*
* @param[out] klass A module or a class.
* @param[in] mid Name of the function.
* @param[in] func The method body.
* @param[in] arity The number of parameters. See @ref defmethod.
* @note There are in fact 18 different prototypes for func.
* @see ::ruby::backward::cxxanyargs::define_method::rb_define_module_function
*/
void rb_define_module_function(VALUE klass, const char *mid, VALUE (*func)(ANYARGS), int arity);
RBIMPL_ATTR_NONNULL(())
/**
* Defines a global function.
*
* @param[in] mid Name of the function.
* @param[in] func The method body.
* @param[in] arity The number of parameters. See @ref defmethod.
* @note There are in fact 18 different prototypes for func.
* @see ::ruby::backward::cxxanyargs::define_method::rb_define_global_function
*/
void rb_define_global_function(const char *mid, VALUE (*func)(ANYARGS), int arity);
RBIMPL_ATTR_NONNULL(())
/**
* Defines an undef of a method. -- What?
*
* In ruby, there are two separate concepts called "undef" and "remove_method".
* The thing you imagine when you "un-define" a method is remove_method. This
* one on the other hand is masking of a previous method definition. Suppose
* for instance:
*
* ```ruby
* class Foo
* def foo
* end
* end
*
* class Bar < Foo
* def bar
* foo
* end
* end
*
* class Baz < Foo
* undef foo # <--- (*1)
* end
* ```
*
* This `undef foo` at `(*1)` must not eliminate `Foo#foo`, because that method
* is also used from `Bar#bar`. So instead of physically executing the target
* method, `undef` inserts a special filtering entry to the class (`Baz` this
* case). That entry, when called, acts as if there were no methods at all.
* But the original can still be accessible, via ways like `Bar#bar` above.
*
* @param[out] klass The class to insert an undef.
* @param[in] name Name of the undef.
* @exception rb_eTypeError `klass` is a non-module.
* @exception rb_eFrozenError `klass` is frozen.
* @see rb_remove_method
*/
void rb_undef_method(VALUE klass, const char *name);
RBIMPL_ATTR_NONNULL(())
/**
* Defines an alias of a method.
*
* @param[in,out] klass The class which the original method belongs
* to; this is also where the new method will
* belong to.
* @param[in] dst A new name for the method.
* @param[in] src The original name of the method.
* @exception rb_eTypeError `klass` is a non-module.
* @exception rb_eFrozenError `klass` is frozen.
* @exception rb_eNameError There is no such method named as `src` in
* `klass`.
*
* @internal
*
* Above description is in fact a bit inaccurate because it ignores
* Refinements.
*/
void rb_define_alias(VALUE klass, const char *dst, const char *src);
RBIMPL_ATTR_NONNULL(())
/**
* Defines public accessor method(s) for an attribute.
*
* @param[out] klass The class which the attribute will belong to.
* @param[in] name Name of the attribute.
* @param[in] read Whether to define a getter method.
* @param[in] write Whether to define a setter method.
* @exception rb_eTypeError `klass` is a non-module.
* @exception rb_eFrozenError `klass` is frozen.
* @exception rb_eNameError `name` invalid as an attr e.g. an operator.
*/
void rb_define_attr(VALUE klass, const char *name, int read, int write);
/** @} */
RBIMPL_SYMBOL_EXPORT_END()
#endif /* RBIMPL_METHOD_H */