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std.math.divCeil: conform to more test cases

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Kate Tsuyu 2020-08-28 11:20:42 -04:00
parent 14b6fb88fb
commit f577d12fbc
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1 changed files with 16 additions and 5 deletions
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lib/std/math.zig
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@ -623,12 +623,16 @@ fn testDivFloor() void {
pub fn divCeil(comptime T: type, numerator: T, denominator: T) !T {
@setRuntimeSafety(false);
if (numerator <= 0) return divTrunc(T, numerator, denominator);
if (@typeInfo(T) == .Float) {
if (denominator == 0) return error.DivisionByZero;
return @ceil(numerator / denominator);
if (denominator == 0) return error.DivisionByZero;
if (@typeInfo(T) == .Float) return @ceil(numerator / denominator);
if (T.is_signed and numerator < 0 and denominator < 0) {
if (numerator == minInt(T) and denominator == -1)
return error.Overflow;
return @divFloor(numerator + 1, denominator) + 1;
}
return (try divFloor(T, numerator - 1, denominator)) + 1;
if (numerator > 0 and denominator > 0)
return @divFloor(numerator - 1, denominator) + 1;
return @divTrunc(numerator, denominator);
}
test "math.divCeil" {
@ -638,11 +642,18 @@ test "math.divCeil" {
fn testDivCeil() void {
testing.expect((divCeil(i32, 5, 3) catch unreachable) == 2);
testing.expect((divCeil(i32, -5, 3) catch unreachable) == -1);
testing.expect((divCeil(i32, 5, -3) catch unreachable) == -1);
testing.expect((divCeil(i32, -5, -3) catch unreachable) == 2);
testing.expect((divCeil(i32, 0, 5) catch unreachable) == 0);
testing.expect((divCeil(u32, 0, 5) catch unreachable) == 0);
testing.expectError(error.DivisionByZero, divCeil(i8, -5, 0));
testing.expectError(error.Overflow, divCeil(i8, -128, -1));
testing.expect((divCeil(f32, 0.0, 5.0) catch unreachable) == 0.0);
testing.expect((divCeil(f32, 5.0, 3.0) catch unreachable) == 2.0);
testing.expect((divCeil(f32, -5.0, 3.0) catch unreachable) == -1.0);
testing.expect((divCeil(f32, 5.0, -3.0) catch unreachable) == -1.0);
testing.expect((divCeil(f32, -5.0, -3.0) catch unreachable) == 2.0);
}
pub fn divExact(comptime T: type, numerator: T, denominator: T) !T {