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Floating-point environment. Handling of floating-point rounding and exceptions (overflow, division by zero, etc.). The types, vars and procs are bindings for the C standard library <fenv.h> header.
Tfenv {.importc: "fenv_t", header: "<fenv.h>", final, pure.} = object
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Represents the entire floating-point environment. The floating-point environment refers collectively to any floating-point status flags and control modes supported by the implementation.
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Tfexcept {.importc: "fexcept_t", header: "<fenv.h>", final, pure.} = object
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Represents the floating-point status flags collectively, including any status the implementation associates with the flags. A floating-point status flag is a system variable whose value is set (but never cleared) when a floating-point exception is raised, which occurs as a side effect of exceptional floating-point arithmetic to provide auxiliary information. A floating-point control mode is a system variable whose value may be set by the user to affect the subsequent behavior of floating-point arithmetic.
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FE_ALL_EXCEPT {.importc, header: "<fenv.h>".}: cint
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bitwise OR of all supported exceptions
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FE_DFL_ENV {.importc, header: "<fenv.h>".}: cint
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macro of type pointer to fenv_t to be used as the argument to functions taking an argument of type fenv_t; in this case the default environment will be used
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FE_DIVBYZERO {.importc, header: "<fenv.h>".}: cint
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division by zero
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FE_DOWNWARD {.importc, header: "<fenv.h>".}: cint
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round toward -Inf
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FE_INEXACT {.importc, header: "<fenv.h>".}: cint
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inexact result
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FE_INVALID {.importc, header: "<fenv.h>".}: cint
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invalid operation
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FE_OVERFLOW {.importc, header: "<fenv.h>".}: cint
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result not representable due to overflow
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FE_TONEAREST {.importc, header: "<fenv.h>".}: cint
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round to nearest
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FE_TOWARDZERO {.importc, header: "<fenv.h>".}: cint
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round toward 0
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FE_UNDERFLOW {.importc, header: "<fenv.h>".}: cint
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result not representable due to underflow
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FE_UPWARD {.importc, header: "<fenv.h>".}: cint
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round toward +Inf
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proc feclearexcept(excepts: cint): cint {.importc, header: "<fenv.h>",
...raises: [], tags: [], forbids: [].}
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Clear the supported exceptions represented by excepts.
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proc fegetenv(envp: ptr Tfenv): cint {.importc, header: "<fenv.h>", ...raises: [],
tags: [], forbids: [].}
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Store the current floating-point environment in the object pointed to by envp.
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proc fegetexceptflag(flagp: ptr Tfexcept; excepts: cint): cint {.importc,
header: "<fenv.h>", ...raises: [], tags: [], forbids: [].}
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Store implementation-defined representation of the exception flags indicated by excepts in the object pointed to by flagp.
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proc fegetround(): cint {.importc, header: "<fenv.h>", ...raises: [], tags: [],
forbids: [].}
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Get current rounding direction.
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proc feholdexcept(envp: ptr Tfenv): cint {.importc, header: "<fenv.h>",
...raises: [], tags: [], forbids: [].}
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Save the current environment in the object pointed to by envp, clear exception flags and install a non-stop mode (if available) for all exceptions.
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proc feraiseexcept(excepts: cint): cint {.importc, header: "<fenv.h>",
...raises: [], tags: [], forbids: [].}
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Raise the supported exceptions represented by excepts.
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proc fesetenv(a1: ptr Tfenv): cint {.importc, header: "<fenv.h>", ...raises: [],
tags: [], forbids: [].}
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Establish the floating-point environment represented by the object pointed to by envp.
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proc fesetexceptflag(flagp: ptr Tfexcept; excepts: cint): cint {.importc,
header: "<fenv.h>", ...raises: [], tags: [], forbids: [].}
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Set complete status for exceptions indicated by excepts according to the representation in the object pointed to by flagp.
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proc fesetround(roundingDirection: cint): cint {.importc, header: "<fenv.h>",
...raises: [], tags: [], forbids: [].}
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Establish the rounding direction represented by roundingDirection.
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proc fetestexcept(excepts: cint): cint {.importc, header: "<fenv.h>",
...raises: [], tags: [], forbids: [].}
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Determine which of subset of the exceptions specified by excepts are currently set.
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proc feupdateenv(envp: ptr Tfenv): cint {.importc, header: "<fenv.h>",
...raises: [], tags: [], forbids: [].}
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Save current exceptions in temporary storage, install environment represented by object pointed to by envp and raise exceptions according to saved exceptions.
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template digits(T: typedesc[float32]): int
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Number of decimal digits that can be represented in a 32-bit floating-point type without losing precision.
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template digits(T: typedesc[float64]): int
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Number of decimal digits that can be represented in a 64-bit floating-point type without losing precision.
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template epsilon(T: typedesc[float32]): float32
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The difference between 1.0 and the smallest number greater than 1.0 that can be represented in a 32-bit floating-point type.
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template epsilon(T: typedesc[float64]): float64
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The difference between 1.0 and the smallest number greater than 1.0 that can be represented in a 64-bit floating-point type.
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template fpRadix(): int
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The (integer) value of the radix used to represent any floating point type on the architecture used to build the program.
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template mantissaDigits(T: typedesc[float32]): int
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Number of digits (in base floatingPointRadix) in the mantissa of 32-bit floating-point numbers.
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template mantissaDigits(T: typedesc[float64]): int
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Number of digits (in base floatingPointRadix) in the mantissa of 64-bit floating-point numbers.
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template minimumPositiveValue(T: typedesc[float32]): float32
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The smallest positive (nonzero) number that can be represented in a 32-bit floating-point type.
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template minimumPositiveValue(T: typedesc[float64]): float64
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The smallest positive (nonzero) number that can be represented in a 64-bit floating-point type.
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