问题描述
我有一个班级:
// add data
if(!_instruments.TryGetValue(tick.Instrument,out var data))
_instruments.Add(tick.Instrument,data = new Data());
data.Add(tick);
...
var Ohcl = _instruments[TickData.Instrument];
// example reading the data
Console.WriteLine(Ohcl.High);
RTC_EXPORT定义为
public class Data
{
private readonly Queue<Tick> _queue = new Queue<Tick>();
public decimal High => _queue.Max(x => x.LatestPrice);
public decimal Low => _queue.Min(x => x.LatestPrice);
public decimal Open => _queue.LastOrDefault()?.LatestPrice ?? 0;
public decimal Close => _queue.FirstOrDefault()?.LatestPrice ?? 0;
public void Add(Tick tick)
{
_queue.Enqueue(tick);
Update();
}
public void Update()
{
var age = DateTime.Now.AddMinutes(-5);
while (_queue.Any() && _queue.Peek().TimeStamp < age)
_queue.Dequeue();
}
}
class RTC_EXPORT PeerConnectionInterface : public rtc::RefCountInterface { ... };
中的RTC_EXPORT有什么作用?
通常,我们在c ++中将类定义为#ifndef RTC_BASE_SYSTEM_RTC_EXPORT_H_
#define RTC_BASE_SYSTEM_RTC_EXPORT_H_
// RTC_EXPORT is used to mark symbols as exported or imported when WebRTC is
// built or used as a shared library.
// When WebRTC is built as a static library the RTC_EXPORT macro expands to
// nothing.
#ifdef WEBRTC_ENABLE_SYMBOL_EXPORT
#ifdef WEBRTC_WIN
#ifdef WEBRTC_LIBRARY_IMPL
#define RTC_EXPORT __declspec(dllexport)
#else
#define RTC_EXPORT __declspec(dllimport)
#endif
#else // WEBRTC_WIN
#if __has_attribute(visibility) && defined(WEBRTC_LIBRARY_IMPL)
#define RTC_EXPORT __attribute__((visibility("default")))
#endif
#endif // WEBRTC_WIN
#endif // WEBRTC_ENABLE_SYMBOL_EXPORT
#ifndef RTC_EXPORT
#define RTC_EXPORT
#endif
#endif // RTC_BASE_SYSTEM_RTC_EXPORT_H_
。额外的MACRO通常会做什么?
解决方法
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