34 lines
725 B
Go
34 lines
725 B
Go
package bits
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// IsOn returns true if *all* bits set in 'bits' are set in 'mask'.
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func IsOn64(mask, bits uint64) 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 IsAnyOn64(mask, bits uint64) 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 Mask64(is ...int) uint64 {
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ret := uint64(0)
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for _, i := range is {
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ret |= MaskOf64(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 MaskOf64(i int) uint64 {
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return uint64(1) << uint64(i)
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}
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// IsPowerOfTwo returns true if v is power of 2.
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func IsPowerOfTwo64(v uint64) bool {
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if v == 0 {
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return false
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}
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return v&(v-1) == 0
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}
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