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Add sign function.

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This commit is contained in:
Stephen Chung 2020-06-25 19:19:16 +08:00
parent fe640e0e13
commit 580a62daaf
2 changed files with 25 additions and 4 deletions
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3
doc/src/language/num-fn.md
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@ -10,8 +10,9 @@ The following standard functions (defined in the [`BasicMathPackage`]({{rootUrl}
operate on `i8`, `i16`, `i32`, `i64`, `f32` and `f64` only:
| Function | Description |
| ------------ | --------------------------------- |
| ------------ | --------------------------------------------------------------- |
| `abs` | absolute value |
| `sign` | returns -1 if the number is negative, +1 if positive, 0 if zero |
| [`to_float`] | converts an integer type to `f64` |
Floating-Point Functions

20
src/packages/arithmetic.rs
View File

@ -267,6 +267,19 @@ macro_rules! reg_op {
$( $lib.set_fn_2($op, $func::<$par>); )*
};
}
macro_rules! reg_sign {
($lib:expr, $op:expr, $ret:ty, $($par:ty),*) => {
$( $lib.set_fn_1($op, |value: $par| -> Result<$ret, _> {
Ok(if value == (0 as $par) {
(0 as $ret)
} else if value < (0 as $par) {
(-1 as $ret)
} else {
(1 as $ret)
})
}); )*
};
}
def_package!(crate:ArithmeticPackage:"Basic arithmetic", lib, {
#[cfg(not(feature = "only_i32"))]
@ -321,6 +334,11 @@ def_package!(crate:ArithmeticPackage:"Basic arithmetic", lib, {
reg_op!(lib, "%", modulo_u, i128, u128);
}
}
reg_sign!(lib, "sign", INT, i8, i16, i32, i64);
#[cfg(not(target_arch = "wasm32"))]
reg_sign!(lib, "sign", INT, i128);
}
// Basic arithmetic for floating-point - no need to check
@ -330,6 +348,8 @@ def_package!(crate:ArithmeticPackage:"Basic arithmetic", lib, {
reg_op!(lib, "-", sub_u, f32);
reg_op!(lib, "*", mul_u, f32);
reg_op!(lib, "/", div_u, f32);
reg_sign!(lib, "sign", f32, f32);
reg_sign!(lib, "sign", f64, f64);
}
#[cfg(not(feature = "only_i32"))]