gitee.com/go-spring2/spring-base@v1.1.3/atomic/bool.go (about)

     1  /*
     2   * Copyright 2012-2019 the original author or authors.
     3   *
     4   * Licensed under the Apache License, Version 2.0 (the "License");
     5   * you may not use this file except in compliance with the License.
     6   * You may obtain a copy of the License at
     7   *
     8   *      https://www.apache.org/licenses/LICENSE-2.0
     9   *
    10   * Unless required by applicable law or agreed to in writing, software
    11   * distributed under the License is distributed on an "AS IS" BASIS,
    12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13   * See the License for the specific language governing permissions and
    14   * limitations under the License.
    15   */
    16  
    17  package atomic
    18  
    19  import (
    20  	"sync/atomic"
    21  
    22  	"gitee.com/go-spring2/spring-base/json"
    23  )
    24  
    25  // A Bool is an atomic bool value.
    26  type Bool struct {
    27  	_ nocopy
    28  	v uint32
    29  }
    30  
    31  func bool2uint(val bool) uint32 {
    32  	if val {
    33  		return 1
    34  	}
    35  	return 0
    36  }
    37  
    38  func uint2bool(val uint32) bool {
    39  	return val != 0
    40  }
    41  
    42  // Load atomically loads and returns the value stored in x.
    43  func (x *Bool) Load() (val bool) {
    44  	return uint2bool(atomic.LoadUint32(&x.v))
    45  }
    46  
    47  // Store atomically stores val into x.
    48  func (x *Bool) Store(val bool) {
    49  	atomic.StoreUint32(&x.v, bool2uint(val))
    50  }
    51  
    52  // Swap atomically stores new into x and returns the old value.
    53  func (x *Bool) Swap(new bool) (old bool) {
    54  	return uint2bool(atomic.SwapUint32(&x.v, bool2uint(new)))
    55  }
    56  
    57  // CompareAndSwap executes the compare-and-swap operation for x.
    58  func (x *Bool) CompareAndSwap(old, new bool) (swapped bool) {
    59  	return atomic.CompareAndSwapUint32(&x.v, bool2uint(old), bool2uint(new))
    60  }
    61  
    62  // MarshalJSON returns the JSON encoding of x.
    63  func (x *Bool) MarshalJSON() ([]byte, error) {
    64  	return json.Marshal(x.Load())
    65  }