const std = @import("../std.zig");
const math = std.math;
const expect = std.testing.expect;
pub inline fn isInf(x: anytype) bool {
const T = @TypeOf(x);
const TBits = std.meta.Int(.unsigned, @typeInfo(T).Float.bits);
const remove_sign = ~@as(TBits, 0) >> 1;
return @bitCast(TBits, x) & remove_sign == @bitCast(TBits, math.inf(T));
}
pub inline fn isPositiveInf(x: anytype) bool {
return x == math.inf(@TypeOf(x));
}
pub inline fn isNegativeInf(x: anytype) bool {
return x == -math.inf(@TypeOf(x));
}
test "math.isInf" {
inline for ([_]type{ f16, f32, f64, f80, f128 }) |T| {
try expect(!isInf(@as(T, 0.0)));
try expect(!isInf(@as(T, -0.0)));
try expect(isInf(math.inf(T)));
try expect(isInf(-math.inf(T)));
try expect(!isInf(math.nan(T)));
try expect(!isInf(-math.nan(T)));
}
}
test "math.isPositiveInf" {
inline for ([_]type{ f16, f32, f64, f80, f128 }) |T| {
try expect(!isPositiveInf(@as(T, 0.0)));
try expect(!isPositiveInf(@as(T, -0.0)));
try expect(isPositiveInf(math.inf(T)));
try expect(!isPositiveInf(-math.inf(T)));
try expect(!isInf(math.nan(T)));
try expect(!isInf(-math.nan(T)));
}
}
test "math.isNegativeInf" {
inline for ([_]type{ f16, f32, f64, f80, f128 }) |T| {
try expect(!isNegativeInf(@as(T, 0.0)));
try expect(!isNegativeInf(@as(T, -0.0)));
try expect(!isNegativeInf(math.inf(T)));
try expect(isNegativeInf(-math.inf(T)));
try expect(!isInf(math.nan(T)));
try expect(!isInf(-math.nan(T)));
}
}