33 lines
1.0 KiB
Zig
33 lines
1.0 KiB
Zig
// SPDX-License-Identifier: MIT
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// Copyright (c) 2015-2020 Zig Contributors
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// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
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// The MIT license requires this copyright notice to be included in all copies
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// and substantial portions of the software.
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const std = @import("../std.zig");
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const math = std.math;
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const expect = std.testing.expect;
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const maxInt = std.math.maxInt;
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/// Returns whether x is a nan.
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pub fn isNan(x: anytype) bool {
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return x != x;
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}
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/// Returns whether x is a signalling nan.
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pub fn isSignalNan(x: anytype) bool {
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// Note: A signalling nan is identical to a standard nan right now but may have a different bit
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// representation in the future when required.
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return isNan(x);
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}
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test "math.isNan" {
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expect(isNan(math.nan(f16)));
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expect(isNan(math.nan(f32)));
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expect(isNan(math.nan(f64)));
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expect(isNan(math.nan(f128)));
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expect(!isNan(@as(f16, 1.0)));
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expect(!isNan(@as(f32, 1.0)));
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expect(!isNan(@as(f64, 1.0)));
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expect(!isNan(@as(f128, 1.0)));
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}
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