C++11 是否有动态分配数组的包装器，比如 Boost 的 scoped_array? [英] Does C++11 have wrappers for dynamically-allocated arrays like Boost's scoped_array?

问题描述

我经常需要在 C++ 中处理动态分配的数组，因此依赖 Boost 来处理 scoped_array、shared_array 等.通读 Stroustrup 的 C++11 FAQ 和 C++11 参考 Wiki，我找不到 C++11 提供的这些动态数组包装器的合适替代品标准.有什么我忽略的地方，还是我必须继续依赖 Boost?

I often need to deal with dynamically-allocated arrays in C++, and hence rely on Boost for scoped_array, shared_array, and the like. After reading through Stroustrup's C++11 FAQ and the C++11 Reference Wiki, I could not find a suitable replacement for these dynamic array wrappers that is provided by the C++11 standard. Is there something that I have overlooked, or do I have to continue relying on Boost?

推荐答案

unique_ptr 有一个特化，比如 unique_ptr.

There is a specialization of unique_ptr, like unique_ptr<T[]>.

#include <iostream>
#include <memory>

struct test
{
  ~test() { std::cout << "test::dtor" << std::endl; }
};

int main()
{
  std::unique_ptr<test[]> array(new test[3]);
}

当您运行它时，您将收到此消息.

When you run it, you will get this messages.

test::dtor
test::dtor
test::dtor

<小时>

如果你想使用 shared_ptr，你应该使用 std::default_delete<T[]> 作为删除器，因为它没有像 这样的shared_ptr.

---

If you want to use shared_ptr, you should use std::default_delete<T[]> for deleter since it doesn't have one like shared_ptr<t[]>.

std::shared_ptr<test> array(new test[3], std::default_delete<test[]>());

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