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US 31-071 15.11p1.12 [cpp.predefined] Overbroad definition of __STDCPP_BFLOAT16_T__ #503

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wg21bot opened this issue Oct 31, 2022 · 2 comments · Fixed by cplusplus/draft#5988
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US 31-071 15.11p1.12 [cpp.predefined] Overbroad definition of __STDCPP_BFLOAT16_T__ #503

wg21bot opened this issue Oct 31, 2022 · 2 comments · Fixed by cplusplus/draft#5988
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wg21bot commented Oct 31, 2022

The wording for the predefined macro __STDCPP_BFLOAT16_T__ added by P1467 can be interpreted more broadly than was intended. See this GitHub issue on the working draft.

Proposed change:

Modify 15.11 [cpp.predefined] paragraph 1 sentence 12 as follows:
Defined as the integer literal 1 if and only if the implementation supports an extended floating-point type with the properties of the typedef-name std::bfloat16_t as described in 6.8.3 [basic.extended.fp].
@wg21bot wg21bot added the CWG Core label Oct 31, 2022
@jensmaurer jensmaurer changed the title US 15.11p1.12 [cpp.predefined] Overbroad definition of __STDCPP_BFLOAT16_T__ US 31-071 15.11p1.12 [cpp.predefined] Overbroad definition of __STDCPP_BFLOAT16_T__ Nov 3, 2022
@jensmaurer jensmaurer transferred this issue from another repository Nov 3, 2022
@jensmaurer jensmaurer added this to the CD C++23 milestone Nov 3, 2022
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CWG2652

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CWG 2022-11-08: Accepted.

@jensmaurer jensmaurer mentioned this issue Nov 19, 2022
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[Motions 2022 11 cwg 4] Issues 2615, 2639, 2640, 2652, and 2653 from P2710R0 cplusplus/draft
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