This is an unofficial snapshot of the ISO/IEC JTC1 SC22 WG21 Core Issues List revision 117b. See http://www.open-std.org/jtc1/sc22/wg21/ for the official list.
2025-08-11
2723. Range of representable values for floating-point typesSection: 6.9.2 [basic.fundamental] Status: DRWP Submitter: Jiang An Date: 2023-04-21[Accepted as a DR at the June, 2023 meeting.]
The range of representable values is defined for integer types, but not for floating-point types. This term is used in 5.13.4 [lex.fcon] paragraph 3 as well as in the library, e.g. in 28.2.3 [charconv.from.chars] and 28.3.4.3.2.3 [facet.num.get.virtuals].
The C standard contains a suitable definition that we should inherit.
Proposed resolution (approved by CWG 2023-05-12):
Add a new paragraph after 6.9.2 [basic.fundamental] paragraph 12 as follows:
... Except as specified in 6.9.3 [basic.extended.fp], the object and value representations and accuracy of operations of floating-point types are implementation-defined.
The minimum range of representable values for a floating-point type is the most negative finite floating-point number representable in that type through the most positive finite floating-point number representable in that type. In addition, if negative infinity is representable in a type, the range of that type is extended to all negative real numbers; likewise, if positive infinity is representable in a type, the range of that type is extended to all positive real numbers. [ Note: Since negative and positive infinity are representable in ISO/IEC/IEEE 60559 formats, all real numbers lie within the range of representable values of a floating-point type adhering to ISO/IEC/IEEE 60559. ]
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