protected override bool SetValue(TValue value, bool replace)
{
var success = false;
if (replace)
{
while (!success)
{
var v = _value;
success = v == Interlocked.CompareExchange(ref _value, ValueBox.Create(value), v);
}
return(true);
}
var set = false;
while (success)
{
var v = _value;
if (null != v)
{
success = true;
set = false;
}
else
{
success = v == Interlocked.CompareExchange(ref _value, ValueBox.Create(value), v);
set = success;
}
}
return(set);
}
protected override bool InitValue(TArg arg, out TValue value)
{
var v = Initializer(arg);
_value = ValueBox.Create(v);
value = v;
return(true);
}
protected override bool SetValue(TValue value, bool replace)
{
if (replace || null == _value)
{
_value = ValueBox.Create(value);
return(true);
}
return(false);
}
public static bool TryGetValue <T>(this ValueBox <T> valueBox, out T value)
{
if (null == valueBox)
{
value = default(T);
return(false);
}
value = valueBox.Value;
return(true);
}
protected override bool SetValue(TValue value, bool replace)
{
return(_lock.Synchronized(() => {
if (replace || null == _value)
{
_value = ValueBox.Create(value);
return true;
}
return false;
}));
}
protected override bool ResetValue()
{
ValueBox <TValue> value = null;
var success = false;
while (!success)
{
value = _value;
Interlocked.MemoryBarrier();
success = value == Interlocked.CompareExchange(ref _value, null, value);
}
return(null == value);
}
protected override bool InitValue(TArg arg, out TValue value)
{
var newValue = ValueBox.Create(Initializer(arg));
Interlocked.MemoryBarrier();
if (null == Interlocked.CompareExchange(ref _value, newValue, null))
{
value = newValue.Value;
return(true);
}
value = _value.Value;
return(false);
}
protected override bool InitValue(TArg arg, out TValue value)
{
_lock.Lock();
try
{
if (null != _value)
{
value = _value.Value;
return(false);
}
var v = Initializer(arg);
_value = ValueBox.Create(v);
value = v;
return(true);
}
finally
{
_lock.Release();
}
}
