math: add maxof[T]() and minof[T]() (#17905)

vlib/math/limit.v

@@ -0,0 +1,68 @@
+// Copyright (c) 2019-2023 Alexander Medvednikov. All rights reserved.
+// Use of this source code is governed by an MIT license
+// that can be found in the LICENSE file.
+module math
+
+// maxof returns the maximum value of the type `T`
+[inline]
+pub fn maxof[T]() T {
+	$if T is i8 {
+		return max_i8
+	} $else $if T is i16 {
+		return max_i16
+	} $else $if T is int {
+		return max_i32
+	} $else $if T is i32 {
+		return max_i32
+	} $else $if T is i64 {
+		return max_i64
+	} $else $if T is u8 {
+		return max_u8
+	} $else $if T is byte {
+		return max_u8
+	} $else $if T is u16 {
+		return max_u16
+	} $else $if T is u32 {
+		return max_u32
+	} $else $if T is u64 {
+		return max_u64
+	} $else $if T is f32 {
+		return max_f32
+	} $else $if T is f64 {
+		return max_f64
+	} $else {
+		panic('A maximum value of the type `${typeof[T]().name}` is not defined.')
+	}
+}
+
+// minof returns the minimum value of the type `T`
+[inline]
+pub fn minof[T]() T {
+	$if T is i8 {
+		return min_i8
+	} $else $if T is i16 {
+		return min_i16
+	} $else $if T is int {
+		return min_i32
+	} $else $if T is i32 {
+		return min_i32
+	} $else $if T is i64 {
+		return min_i64
+	} $else $if T is u8 {
+		return min_u8
+	} $else $if T is byte {
+		return min_u8
+	} $else $if T is u16 {
+		return min_u16
+	} $else $if T is u32 {
+		return min_u32
+	} $else $if T is u64 {
+		return min_u64
+	} $else $if T is f32 {
+		return -max_f32
+	} $else $if T is f64 {
+		return -max_f64
+	} $else {
+		panic('A minimum value of the type `${typeof[T]().name}` is not defined.')
+	}
+}