C++ QscopeDarray指针保护我的数据，但它仍在泄漏

就在运行时错误之前，变量数据已完全创建。为什么不调用数据析构函数

---

另外，在这种情况下，如何确保内存不会泄漏？

我认为问题在于您的异常是未捕获的，并且正在由terminate处理程序处理。由于没有

catch

来处理异常，编译器无法知道要“展开”多少。如果捕获到异常，则会发生破坏。如果愿意，您当然可以重新抛出它，例如：

Construct a data 
Construct a data 
Construct a data 
Construct a data 
Construct a data 
Construct a data 
Construct a data 
Construct a data 
Construct a data 
Construct a data 
terminate called after throwing an instance of 'std::runtime_error'
  what():  Shit happens
The program has unexpectedly finished.

---

你在期待什么？没有调用析构函数，因为没有捕获到

std:：runtime_错误

。我希望既然数据构造完成，它的析构函数将自动调用。如何确保在发生异常时释放已分配的数据？如果从构造函数中抛出具体异常，则作用域数组可能仍有引用。理想情况下，您希望捕获此异常并进行处理，而不是放弃。事实上，我的第一条评论是错误的，对不起。问题是，您正在从构造函数中抛出。当您从构造函数中抛出时，对象未完全构造，因此不会调用它的析构函数。

Construct a data 
Construct a data 
Construct a data 
Construct a data 
Construct a data 
Construct a data 
Construct a data 
Construct a data 
Construct a data 
Construct a data 
terminate called after throwing an instance of 'std::runtime_error'
  what():  Shit happens
The program has unexpectedly finished.

#include <QScopedArrayPointer>
#include <QDebug>
#include <stdexcept>

class MyData{
public:
  MyData() {
    qDebug() << "Construct a data";
  }

  ~MyData() {
    qDebug() << "Delete a data";
  }

private:
  float internal_data_;
};

class MyClass{
  QScopedArrayPointer<MyData> data_;
public:
  MyClass(){
    data_.reset(new MyData[10]);

    throw std::runtime_error("Shit happens");
  }
};

int main(int argc, char *argv[]) {
    try {
        MyClass a_class;
    } catch (const std::runtime_error &) {
        throw;
    }
}

$ ./test2 
Construct a data 
Construct a data 
Construct a data                                                                                                                     
Construct a data                                                                                                                     
Construct a data                                                                                                                     
Construct a data                                                                                                                     
Construct a data 
Construct a data 
Construct a data 
Construct a data 
Delete a data 
Delete a data 
Delete a data 
Delete a data 
Delete a data 
Delete a data 
Delete a data 
Delete a data 
Delete a data 
Delete a data 
terminate called after throwing an instance of 'std::runtime_error'
  what():  Shit happens
Aborted