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Added some explicit comptime to Quantity

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adrien 2026-04-21 17:41:37 +02:00
parent 998404d82a
commit 7b038dd2a5
1 changed files with 12 additions and 11 deletions
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23
src/Quantity.zig
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@ -7,7 +7,7 @@ const UnitScale = Scales.UnitScale;
const Dimensions = @import("Dimensions.zig"); const Dimensions = @import("Dimensions.zig");
const Dimension = Dimensions.Dimension; const Dimension = Dimensions.Dimension;
pub fn Quantity(T: type, d: Dimensions, s: Scales) type { pub fn Quantity(comptime T: type, comptime d: Dimensions, comptime s: Scales) type {
return struct { return struct {
value: T, value: T,
@ -84,13 +84,13 @@ pub fn Quantity(T: type, d: Dimensions, s: Scales) type {
// Fast-path: Native pure-integer exact conversions // Fast-path: Native pure-integer exact conversions
if (comptime @typeInfo(T) == .int and @typeInfo(DestT) == .int) { if (comptime @typeInfo(T) == .int and @typeInfo(DestT) == .int) {
if (ratio >= 1.0 and @round(ratio) == ratio) { if (comptime ratio >= 1.0 and @round(ratio) == ratio) {
const mult: DestT = @intFromFloat(ratio); const mult: DestT = comptime @intFromFloat(ratio);
return .{ .value = @as(DestT, @intCast(self.value)) * mult }; return .{ .value = @as(DestT, @intCast(self.value)) * mult };
} else if (ratio < 1.0 and @round(1.0 / ratio) == 1.0 / ratio) { } else if (comptime ratio < 1.0 and @round(1.0 / ratio) == 1.0 / ratio) {
const div: DestT = @intFromFloat(1.0 / ratio); const div: DestT = comptime @intFromFloat(1.0 / ratio);
const val = @as(DestT, @intCast(self.value)); const val = @as(DestT, @intCast(self.value));
const half = div / 2; const half = comptime div / 2;
// Native round-to-nearest // Native round-to-nearest
const rounded = if (val >= 0) @divTrunc(val + half, div) else @divTrunc(val - half, div); const rounded = if (val >= 0) @divTrunc(val + half, div) else @divTrunc(val - half, div);
return .{ .value = rounded }; return .{ .value = rounded };
@ -100,21 +100,22 @@ pub fn Quantity(T: type, d: Dimensions, s: Scales) type {
// Fallback preserving native Float types (e.g., f128 shouldn't downcast to f64) // Fallback preserving native Float types (e.g., f128 shouldn't downcast to f64)
if (comptime @typeInfo(DestT) == .float) { if (comptime @typeInfo(DestT) == .float) {
const val_f = switch (@typeInfo(T)) { const val_f = switch (@typeInfo(T)) {
.int => @as(DestT, @floatFromInt(self.value)), inline .int => @as(DestT, @floatFromInt(self.value)),
.float => @as(DestT, @floatCast(self.value)), inline .float => @as(DestT, @floatCast(self.value)),
else => unreachable, else => unreachable,
}; };
return .{ .value = val_f * @as(DestT, @floatCast(ratio)) }; return .{ .value = val_f * @as(DestT, @floatCast(ratio)) };
} else { } else {
const val_f = switch (@typeInfo(T)) { const val_f = switch (@typeInfo(T)) {
.int => @as(f64, @floatFromInt(self.value)), inline .int => @as(f64, @floatFromInt(self.value)),
.float => @as(f64, @floatCast(self.value)), inline .float => @as(f64, @floatCast(self.value)),
else => unreachable, else => unreachable,
}; };
return .{ .value = @intFromFloat(@round(val_f * ratio)) }; return .{ .value = @intFromFloat(@round(val_f * ratio)) };
} }
} }
pub fn Vec(self: Self, comptime len: usize) QuantityVec(len, Self) {
pub fn Vec(self: Self, comptime len: comptime_int) QuantityVec(len, Self) {
return QuantityVec(len, Self).initDefault(self.value); return QuantityVec(len, Self).initDefault(self.value);
} }