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Windows MSVC < 2012 'round' function update

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Microsoft Visual C++ compilers prior to 2012 do not implement the 'round', 'roundl' or 'roundf' functions.
This change is fixes this. Tested it with MSVC 2010.
This commit is contained in:
matkuki 2016-06-17 21:52:41 +02:00 • committed by GitHub
commit f9a659f7ab
1 changed files with 11 additions and 5 deletions
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16
lib/pure/math.nim
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@ -138,11 +138,6 @@ when not defined(JS):
proc exp*(x: float64): float64 {.importc: "exp", header: "<math.h>".} proc exp*(x: float64): float64 {.importc: "exp", header: "<math.h>".}
## Computes the exponential function of `x` (pow(E, x)) ## Computes the exponential function of `x` (pow(E, x))
proc round0(x: float32): float32 {.importc: "roundf", header: "<math.h>".}
proc round0(x: float64): float64 {.importc: "round", header: "<math.h>".}
## Converts a float to an int by rounding. Used internally by the round
## function when the specified number of places is 0.
proc arccos*(x: float32): float32 {.importc: "acosf", header: "<math.h>".} proc arccos*(x: float32): float32 {.importc: "acosf", header: "<math.h>".}
proc arccos*(x: float64): float64 {.importc: "acos", header: "<math.h>".} proc arccos*(x: float64): float64 {.importc: "acos", header: "<math.h>".}
## Computes the arc cosine of `x` ## Computes the arc cosine of `x`
@ -225,6 +220,17 @@ when not defined(JS):
## .. code-block:: nim ## .. code-block:: nim
## echo ceil(-2.1) ## -2.0 ## echo ceil(-2.1) ## -2.0
when defined(windows):
proc round0[T: float32|float64](x: T): T =
## Windows compilers prior to MSVC 2012 do not implement 'round',
## 'roundl' or 'roundf'.
result = if x < 0.0: ceil(x - T(0.5)) else: floor(x + T(0.5))
else:
proc round0(x: float32): float32 {.importc: "roundf", header: "<math.h>".}
proc round0(x: float64): float64 {.importc: "round", header: "<math.h>".}
## Converts a float to an int by rounding. Used internally by the round
## function when the specified number of places is 0.
proc fmod*(x, y: float32): float32 {.importc: "fmodf", header: "<math.h>".} proc fmod*(x, y: float32): float32 {.importc: "fmodf", header: "<math.h>".}
proc fmod*(x, y: float64): float64 {.importc: "fmod", header: "<math.h>".} proc fmod*(x, y: float64): float64 {.importc: "fmod", header: "<math.h>".}
## Computes the remainder of `x` divided by `y` ## Computes the remainder of `x` divided by `y`