32 lines
752 B
Go
32 lines
752 B
Go
package errors
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import (
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"sync/atomic"
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)
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// OnceError is an error structure that supports safe multi
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// threaded usage and setting only once (until reset).
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type OnceError struct{ ptr atomic.Pointer[error] }
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// Store will safely set the OnceError to value, no-op if nil.
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func (e *OnceError) Store(err error) bool {
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if err == nil {
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return false
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}
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return e.ptr.CompareAndSwap(nil, &err)
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}
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// Load will load the currently stored error.
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func (e *OnceError) Load() error {
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if ptr := e.ptr.Load(); ptr != nil {
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return *ptr
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}
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return nil
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}
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// IsSet returns whether OnceError has been set.
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func (e *OnceError) IsSet() bool { return (e.ptr.Load() != nil) }
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// Reset will reset the OnceError value.
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func (e *OnceError) Reset() { e.ptr.Store(nil) }
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