45 lines
1.2 KiB
Go
45 lines
1.2 KiB
Go
// Copyright 2018 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package bits
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// Non-atomic bit operations on a template type T.
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// T is a required type parameter that must be an integral type.
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type T uint64
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// IsOn returns true if *all* bits set in 'bits' are set in 'mask'.
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func IsOn(mask, bits T) bool {
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return mask&bits == bits
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}
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// IsAnyOn returns true if *any* bit set in 'bits' is set in 'mask'.
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func IsAnyOn(mask, bits T) bool {
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return mask&bits != 0
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}
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// Mask returns a T with all of the given bits set.
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func Mask(is ...int) T {
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ret := T(0)
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for _, i := range is {
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ret |= MaskOf(i)
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}
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return ret
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}
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// MaskOf is like Mask, but sets only a single bit (more efficiently).
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func MaskOf(i int) T {
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return T(1) << T(i)
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}
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