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72 lines
2.7 KiB
C++
72 lines
2.7 KiB
C++
#ifndef RBIMPL_ARITHMETIC_DOUBLE_H /*-*-C++-*-vi:se ft=cpp:*/
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#define RBIMPL_ARITHMETIC_DOUBLE_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 Arithmetic conversion between C's `double` and Ruby's.
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*/
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#include "ruby/internal/attr/pure.h"
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#include "ruby/internal/dllexport.h"
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#include "ruby/internal/value.h"
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#define NUM2DBL rb_num2dbl /**< @old{rb_num2dbl} */
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#define RFLOAT_VALUE rb_float_value /**< @old{rb_float_value} */
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#define DBL2NUM rb_float_new /**< @old{rb_float_new} */
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RBIMPL_SYMBOL_EXPORT_BEGIN()
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/**
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* Converts an instance of ::rb_cNumeric into C's `double`.
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*
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* @param[in] num Something numeric.
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* @exception rb_eTypeError `num` is not a numeric.
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* @return The passed value converted into C's `double`.
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*/
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double rb_num2dbl(VALUE num);
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RBIMPL_ATTR_PURE()
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/**
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* Extracts its double value from an instance of ::rb_cFloat.
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*
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* @param[in] num An instance of ::rb_cFloat.
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* @pre Must not pass anything other than a Fixnum.
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* @return The passed value converted into C's `double`.
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*/
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double rb_float_value(VALUE num);
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/**
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* Converts a C's `double` into an instance of ::rb_cFloat.
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*
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* @param[in] d Arbitrary `double` value.
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* @return An instance of ::rb_cFloat.
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*/
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VALUE rb_float_new(double d);
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/**
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* Identical to rb_float_new(), except it does not generate Flonums.
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*
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* @param[in] d Arbitrary `double` value.
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* @return An instance of ::rb_cFloat.
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*
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* @internal
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*
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* @shyouhei has no idea why it is here.
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*/
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VALUE rb_float_new_in_heap(double d);
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RBIMPL_SYMBOL_EXPORT_END()
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#endif /* RBIMPL_ARITHMETIC_DOUBLE_H */
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