parent
e6ef00233e
commit
0bf6796b76
34
std/math.zig
34
std/math.zig
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@ -245,25 +245,20 @@ pub fn floatExponentBits(comptime T: type) comptime_int {
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/// Given two types, returns the smallest one which is capable of holding the
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/// full range of the minimum value.
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pub fn Min(comptime A: type, comptime B: type) type {
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return switch (@typeInfo(A)) {
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switch (@typeInfo(A)) {
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.Int => |a_info| switch (@typeInfo(B)) {
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.Int => |b_info| blk: {
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if (a_info.is_signed == b_info.is_signed) {
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break :blk if (a_info.bits < b_info.bits) A else B;
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} else if (a_info.is_signed) {
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break :blk A;
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.Int => |b_info| if (!a_info.is_signed and !b_info.is_signed) {
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if (a_info.bits < b_info.bits) {
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return A;
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} else {
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break :blk B;
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return B;
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}
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},
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.ComptimeInt => A,
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else => @compileError("unsupported type: " ++ @typeName(B)),
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else => {},
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},
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.Float => |a_info| if (a_info.bits < @typeInfo(B).Float.bits) A else B,
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.ComptimeInt => B,
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.ComptimeFloat => B,
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else => @compileError("unsupported type: " ++ @typeName(A)),
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};
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else => {},
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}
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return @typeOf(A(0) + B(0));
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}
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/// Returns the smaller number. When one of the parameter's type's full range fits in the other,
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@ -275,7 +270,6 @@ pub fn min(x: var, y: var) Min(@typeOf(x), @typeOf(y)) {
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// scope it is known to fit in the return type.
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switch (@typeInfo(Result)) {
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.Int => return @intCast(Result, x),
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.Float => return @floatCast(Result, x),
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else => return x,
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}
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} else {
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@ -283,7 +277,6 @@ pub fn min(x: var, y: var) Min(@typeOf(x), @typeOf(y)) {
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// scope it is known to fit in the return type.
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switch (@typeInfo(Result)) {
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.Int => return @intCast(Result, y),
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.Float => return @floatCast(Result, y),
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else => return y,
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}
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}
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@ -302,9 +295,16 @@ test "math.min" {
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var a: f64 = 10.34;
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var b: f32 = 999.12;
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var result = min(a, b);
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testing.expect(@typeOf(result) == f32);
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testing.expect(@typeOf(result) == f64);
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testing.expect(result == 10.34);
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}
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{
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var a: i8 = -127;
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var b: i16 = -200;
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var result = min(a, b);
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testing.expect(@typeOf(result) == i16);
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testing.expect(result == -200);
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}
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}
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pub fn max(x: var, y: var) @typeOf(x + y) {
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