gitee.com/go-spring2/spring-base@v1.1.3/atomic/float64.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  	"math"
    21  	"sync/atomic"
    22  
    23  	"gitee.com/go-spring2/spring-base/json"
    24  )
    25  
    26  // A Float64 is an atomic float64 value.
    27  type Float64 struct {
    28  	_ nocopy
    29  	v uint64
    30  }
    31  
    32  // Add atomically adds delta to x and returns the new value.
    33  func (x *Float64) Add(delta float64) (new float64) {
    34  	return math.Float64frombits(atomic.AddUint64(&x.v, math.Float64bits(delta)))
    35  }
    36  
    37  // Load atomically loads and returns the value stored in x.
    38  func (x *Float64) Load() (val float64) {
    39  	return math.Float64frombits(atomic.LoadUint64(&x.v))
    40  }
    41  
    42  // Store atomically stores val into x.
    43  func (x *Float64) Store(val float64) {
    44  	atomic.StoreUint64(&x.v, math.Float64bits(val))
    45  }
    46  
    47  // Swap atomically stores new into x and returns the old value.
    48  func (x *Float64) Swap(new float64) (old float64) {
    49  	return math.Float64frombits(atomic.SwapUint64(&x.v, math.Float64bits(new)))
    50  }
    51  
    52  // CompareAndSwap executes the compare-and-swap operation for x.
    53  func (x *Float64) CompareAndSwap(old, new float64) (swapped bool) {
    54  	return atomic.CompareAndSwapUint64(&x.v, math.Float64bits(old), math.Float64bits(new))
    55  }
    56  
    57  // MarshalJSON returns the JSON encoding of x.
    58  func (x *Float64) MarshalJSON() ([]byte, error) {
    59  	return json.Marshal(x.Load())
    60  }