Mac 上 C++ 中的分段错误 11
当我尝试运行时
int N=10000000;
short res[N];
我得到分段错误 11
当我换成
int N=1000000;
short res[N];
效果很好
推荐答案
您已超出操作系统提供的堆栈空间.如果需要更多内存,最简单的方法是动态分配:
You've exceeded your stack space given by the OS. If you need more memory, the easiest way is to allocate it dynamically:
int N=1000000;
short* res = new short[N];
但是,在这种情况下,std::vector
是首选,因为上述要求您手动释放
内存.
However, std::vector
is preferred in this context, because the above requires you to free
the memory by hand.
int N = 1000000;
std::vector<short> res (N);
如果你可以使用 C++11,你也可以通过使用 unique_ptr
数组特化来节省一些时间:
If you can use C++11, you can possibly save some fraction of time by using unique_ptr
array specialization, too:
std::unique_ptr<short[]> res (new short[N]);
由于重载了 operator[]
,上述两个自动方法仍然可以与熟悉的 res[index]
语法一起使用,但要获取内存操作的原始指针你需要 res.data()
和 vector
或 res.get()
和 unique_ptr
.
Both of the automatic methods above can still be used with familiar res[index]
syntax thanks to overloaded operator[]
, but to get the raw pointer for memory operations you'd need res.data()
with vector
or res.get()
with unique_ptr
.
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