145 lines
4.8 KiB
C++
145 lines
4.8 KiB
C++
#ifndef RBIMPL_RHASH_H /*-*-C++-*-vi:se ft=cpp:*/
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#define RBIMPL_RHASH_H
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/**
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* @file
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* @author Ruby developers <ruby-core@ruby-lang.org>
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* @copyright This file is a part of the programming language Ruby.
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* Permission is hereby granted, to either redistribute and/or
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* modify this file, provided that the conditions mentioned in the
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* file COPYING are met. Consult the file for details.
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* @warning Symbols prefixed with either `RBIMPL` or `rbimpl` are
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* implementation details. Don't take them as canon. They could
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* rapidly appear then vanish. The name (path) of this header file
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* is also an implementation detail. Do not expect it to persist
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* at the place it is now. Developers are free to move it anywhere
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* anytime at will.
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* @note To ruby-core: remember that this header can be possibly
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* recursively included from extension libraries written in C++.
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* Do not expect for instance `__VA_ARGS__` is always available.
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* We assume C99 for ruby itself but we don't assume languages of
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* extension libraries. They could be written in C++98.
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* @brief Routines to manipulate struct RHash.
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* @note The struct RHash itself is opaque.
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*/
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#include "ruby/internal/config.h"
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#ifdef STDC_HEADERS
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# include <stddef.h>
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#endif
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#include "ruby/internal/dllexport.h"
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#include "ruby/internal/value.h"
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#if !defined RUBY_EXPORT && !defined RUBY_NO_OLD_COMPATIBILITY
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# include "ruby/backward.h"
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#endif
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/**
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* Retrieves the internal table.
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*
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* @param[in] h An instance of RHash.
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* @pre `h` must be of ::RUBY_T_HASH.
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* @return A struct st_table which has the contents of this hash.
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* @note Nowadays as Ruby evolved over ages, RHash has multiple backend
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* storage engines. `h`'s backend is not guaranteed to be a
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* st_table. This function creates one when necessary.
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*/
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#define RHASH_TBL(h) rb_hash_tbl(h, __FILE__, __LINE__)
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/**
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* @private
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*
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* @deprecated This macro once was a thing in the old days, but makes no sense
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* any longer today. Exists here for backwards compatibility
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* only. You can safely forget about it.
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*
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* @internal
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*
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* Declaration of rb_hash_iter_lev() is at include/ruby/backward.h.
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*/
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#define RHASH_ITER_LEV(h) rb_hash_iter_lev(h)
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/**
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* @private
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*
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* @deprecated This macro once was a thing in the old days, but makes no sense
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* any longer today. Exists here for backwards compatibility
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* only. You can safely forget about it.
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*
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* @internal
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*
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* Declaration of rb_hash_ifnone() is at include/ruby/backward.h.
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*/
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#define RHASH_IFNONE(h) rb_hash_ifnone(h)
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/**
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* Queries the size of the hash. Size here means the number of keys that the
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* hash stores.
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*
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* @param[in] h An instance of RHash.
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* @pre `h` must be of ::RUBY_T_HASH.
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* @return The size of the hash.
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*/
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#define RHASH_SIZE(h) rb_hash_size_num(h)
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/**
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* Checks if the hash is empty.
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*
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* @param[in] h An instance of RHash.
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* @pre `h` must be of ::RUBY_T_HASH.
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* @retval true It is.
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* @retval false It isn't.
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*/
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#define RHASH_EMPTY_P(h) (RHASH_SIZE(h) == 0)
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/**
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* Destructively updates the default value of the hash.
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*
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* @param[out] h An instance of RHash.
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* @param[in] ifnone Arbitrary default value.
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* @pre `h` must be of ::RUBY_T_HASH.
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*
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* @internal
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*
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* But why you can set this, given rb_hash_ifnone() doesn't exist?
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*/
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#define RHASH_SET_IFNONE(h, ifnone) rb_hash_set_ifnone((VALUE)h, ifnone)
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struct st_table; /* in ruby/st.h */
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RBIMPL_SYMBOL_EXPORT_BEGIN()
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/**
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* This is the implementation detail of #RHASH_SIZE. People don't call this
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* directly.
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*
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* @param[in] hash An instance of RHash.
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* @pre `hash` must be of ::RUBY_T_HASH.
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* @return The size of the hash.
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*/
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size_t rb_hash_size_num(VALUE hash);
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/**
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* This is the implementation detail of #RHASH_TBL. People don't call this
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* directly.
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*
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* @param[in] hash An instance of RHash.
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* @param[in] file The `__FILE__`.
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* @param[in] line The `__LINE__`.
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* @pre `hash` must be of ::RUBY_T_HASH.
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* @return Table that has the contents of the hash.
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*/
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struct st_table *rb_hash_tbl(VALUE hash, const char *file, int line);
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/**
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* This is the implementation detail of #RHASH_SET_IFNONE. People don't call
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* this directly.
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*
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* @param[out] hash An instance of RHash.
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* @param[in] ifnone Arbitrary default value.
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* @pre `hash` must be of ::RUBY_T_HASH.
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*/
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VALUE rb_hash_set_ifnone(VALUE hash, VALUE ifnone);
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RBIMPL_SYMBOL_EXPORT_END()
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#endif /* RBIMPL_RHASH_H */
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