add min_pos_value constant for floats #13735
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Follow-up on issue rust-lang#13297 and PR rust-lang#13710. Instead of following the (confusing) C/C++ approach of using `MIN_VALUE` for the smallest *positive* number, we introduce `MIN_POS_VALUE` (and in the Float trait, `min_pos_value`) to represent this number. This patch also removes a few remaining redundantly-defined constants that were missed last time around.
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/cc @bjz |
| pub static MIN_VALUE: f32 = 1.17549435e-38_f32; | ||
| /// Maximum f32 value | ||
| /// Smallest finite f32 value | ||
| pub static MIN_VALUE: f32 = -3.40282347e+38_f32; |
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Is there a different but still reasonable name for this? It may be confusing for someone who's used to C's weird definition and tries to use this constant without looking at the value.
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This doesn't shock me since Rust tries to fix the C/C++ legacy in various domains... plus I would expect a newcomer to at least lookup the function name/doc on rustdoc.
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C++11 introduced numeric_limits::lowest, but that's an ugly backwards compatibility workaround. So long as we document this, I think it is good to get this right from the start.
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Looks good! r+ from me. @brson? |
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Follow-up on issue #13297 and PR #13710. Instead of following the (confusing) C/C++ approach of using `MIN_VALUE` for the smallest *positive* number, we introduce `MIN_POS_VALUE` (and in the Float trait, `min_pos_value`) to represent this number. This patch also removes a few remaining redundantly-defined constants that were missed last time around.
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Follow-up on issue #13297 and PR #13710. Instead of following the (confusing) C/C++ approach
of using
MIN_VALUEfor the smallest positive number, we introduceMIN_POS_VALUE(andin the Float trait,
min_pos_value) to represent this number.This patch also removes a few remaining redundantly-defined constants that were missed last
time around.