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struct.h
#ifndef RBIMPL_INTERN_STRUCT_H /*-*-C++-*-vi:se ft=cpp:*/ #define RBIMPL_INTERN_STRUCT_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 Public APIs related to ::rb_cStruct. */ #include "ruby/internal/attr/nonnull.h" #include "ruby/internal/dllexport.h" #include "ruby/internal/intern/vm.h" /* rb_alloc_func_t */ #include "ruby/internal/value.h" RBIMPL_SYMBOL_EXPORT_BEGIN() /* struct.c */ /** * Creates an instance of the given struct. * * @param[in] klass The class of the instance to allocate. * @param[in] ... The fields. * @return Allocated instance of `klass`. * @pre `klass` must be a subclass of ::rb_cStruct. * @note Number of variadic arguments must much that of the passed klass' * fields. */ VALUE rb_struct_new(VALUE klass, ...); /** * Defines a struct class. * * @param[in] name Name of the class. * @param[in] ... Arbitrary number of `const char*`, terminated by * zero. Each of which are the name of fields. * @exception rb_eNameError `name` is not a constant name. * @exception rb_eTypeError `name` is already taken. * @exception rb_eArgError Duplicated field name. * @return The defined class. * @post Global toplevel constant `name` is defined. * @note `name` is allowed to be a null pointer. This function creates * an anonymous struct class then. * * @internal * * Not seriously checked but it seems this function does not share its * implementation with how `Struct.new` is implemented...? */ VALUE rb_struct_define(const char *name, ...); RBIMPL_ATTR_NONNULL((2)) /** * Identical to rb_struct_define(), except it defines the class under the * specified namespace instead of global toplevel. * * @param[out] space Namespace that the defining class shall reside. * @param[in] name Name of the class. * @param[in] ... Arbitrary number of `const char*`, terminated by * zero. Each of which are the name of fields. * @exception rb_eNameError `name` is not a constant name. * @exception rb_eTypeError `name` is already taken. * @exception rb_eArgError Duplicated field name. * @return The defined class. * @post `name` is a constant under `space`. * @note In contrast to rb_struct_define(), it doesn't make any sense to * pass a null pointer to this function. */ VALUE rb_struct_define_under(VALUE space, const char *name, ...); /** * Identical to rb_struct_new(), except it takes the field values as a Ruby * array. * * @param[in] klass The class of the instance to allocate. * @param[in] values Field values. * @return Allocated instance of `klass`. * @pre `klass` must be a subclass of ::rb_cStruct. * @pre `values` must be an instance of struct ::RArray. */ VALUE rb_struct_alloc(VALUE klass, VALUE values); /** * Mass-assigns a struct's fields. * * @param[out] self An instance of a struct class to squash. * @param[in] values New values. * @return ::RUBY_Qnil. */ VALUE rb_struct_initialize(VALUE self, VALUE values); /** * Identical to rb_struct_aref(), except it takes ::ID instead of ::VALUE. * * @param[in] self An instance of a struct class. * @param[in] key Key to query. * @exception rb_eTypeError `self` is not a struct. * @exception rb_eNameError No such field. * @return The value stored at `key` in `self`. */ VALUE rb_struct_getmember(VALUE self, ID key); /** * Queries the list of the names of the fields of the given struct class. * * @param[in] klass A subclass of ::rb_cStruct. * @return The list of the names of the fields of `klass`. */ VALUE rb_struct_s_members(VALUE klass); /** * Queries the list of the names of the fields of the class of the given struct * object. This is almost the same as calling rb_struct_s_members() over the * class of the receiver. * * @internal * * "Almost"? What exactly is the difference? * * @endinternal * * @param[in] self An instance of a subclass of ::rb_cStruct. * @return The list of the names of the fields. */ VALUE rb_struct_members(VALUE self); /** * Allocates an instance of the given class. This consequential name is of * course because rb_struct_alloc() not only allocates but also initialises an * instance. The API design is broken. * * @param[in] klass A subclass of ::rb_cStruct. * @return An allocated instance of `klass`, not initialised. */ VALUE rb_struct_alloc_noinit(VALUE klass); /** * Identical to rb_struct_define(), except it does not define accessor methods. * You have to define them yourself. Forget about the allocator function * parameter; it is for internal use only. Extension libraries are unable to * properly allocate a ruby struct, because `RStruct` is opaque. * * @internal * * Several flags must be set up properly for ::RUBY_T_STRUCT objects, which are * also missing for extension libraries. * * @endinternal * * @param[in] name Name of the class. * @param[in] super Superclass of the defining class. * @param[in] func Must be 0 for extension libraries. * @param[in] ... Arbitrary number of `const char*`, terminated by * zero. Each of which are the name of fields. * @exception rb_eNameError `name` is not a constant name. * @exception rb_eTypeError `name` is already taken. * @exception rb_eArgError Duplicated field name. * @return The defined class. * @post Global toplevel constant `name` is defined. * @note `name` is allowed to be a null pointer. This function creates * an anonymous struct class then. */ VALUE rb_struct_define_without_accessor(const char *name, VALUE super, rb_alloc_func_t func, ...); RBIMPL_ATTR_NONNULL((2)) /** * Identical to rb_struct_define_without_accessor(), except it defines the * class under the specified namespace instead of global toplevel. It can also * be seen as a routine identical to rb_struct_define_under(), except it does * not define accessor methods. * * @param[out] outer Namespace that the defining class shall reside. * @param[in] class_name Name of the class. * @param[in] super Superclass of the defining class. * @param[in] alloc Must be 0 for extension libraries. * @param[in] ... Arbitrary number of `const char*`, terminated by * zero. Each of which are the name of fields. * @exception rb_eNameError `class_name` is not a constant name. * @exception rb_eTypeError `class_name` is already taken. * @exception rb_eArgError Duplicated field name. * @return The defined class. * @post `class_name` is a constant under `outer`. * @note In contrast to rb_struct_define_without_accessor(), it doesn't * make any sense to pass a null name. */ VALUE rb_struct_define_without_accessor_under(VALUE outer, const char *class_name, VALUE super, rb_alloc_func_t alloc, ...); RBIMPL_SYMBOL_EXPORT_END() #endif /* RBIMPL_INTERN_STRUCT_H */
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