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Document the difference between toFloat/toInt and type conversion (#17894)

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Gabriel Huber 2021-04-30 22:39:25 +02:00 • committed by GitHub
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@ -1472,7 +1472,7 @@ type # these work for most platforms:
PInt32* = ptr int32 ## An alias for `ptr int32`. PInt32* = ptr int32 ## An alias for `ptr int32`.
proc toFloat*(i: int): float {.noSideEffect, inline.} = proc toFloat*(i: int): float {.noSideEffect, inline.} =
## Converts an integer `i` into a `float`. ## Converts an integer `i` into a `float`. Same as `float(i)`.
## ##
## If the conversion fails, `ValueError` is raised. ## If the conversion fails, `ValueError` is raised.
## However, on most platforms the conversion cannot fail. ## However, on most platforms the conversion cannot fail.
@ -1494,7 +1494,8 @@ proc toInt*(f: float): int {.noSideEffect.} =
## ##
## Conversion rounds `f` half away from 0, see ## Conversion rounds `f` half away from 0, see
## `Round half away from zero ## `Round half away from zero
## <https://en.wikipedia.org/wiki/Rounding#Round_half_away_from_zero>`_. ## <https://en.wikipedia.org/wiki/Rounding#Round_half_away_from_zero>`_,
## as opposed to a type conversion which rounds towards zero.
## ##
## Note that some floating point numbers (e.g. infinity or even 1e19) ## Note that some floating point numbers (e.g. infinity or even 1e19)
## cannot be accurately converted. ## cannot be accurately converted.