编译器初始化杭大STD时::阵列 [英] Compiler hang when initializing large std::arrays

问题描述

我需要初始化一个非常大的多维的std ::数据阵列：

 类的东西;世界级
{
上市：
    世界（）{空间} nullptr {};
    〜世（）=默认值;
私人的：
    静态无符号整型常量的大小= 1000;
    的std ::阵列＆LT;的std ::阵列＆LT;的std ::阵列＆LT;的std ::的unique_ptr＆LT;东西＆gt;中尺寸＆gt;中尺寸＆gt;中规模＆GT;空间;
};
 

如果您尝试实例化这个，G ++ 4.8.2电抗器：它消耗所有可用内存，并不会返回。也就是说，编译器挂起，我从来没有得到一个可执行文件。 这是为什么？注意铛++没有麻烦。

注：我充分认识到，把堆栈上这么多的数据可能会溢出它。 什么是初始化堆的最好方法是什么？我觉得做空格引用（到分配的内存），将是最好的方式，但我想不通的语法了。

解决方案

好吧，我无法解释为什么G ++是在这个令人作呕的细微差别，但要等到工作了这一点，认为这是为你的成员声明：

<$p$p><$c$c>std::vector<std::array<std::array<std::unique_ptr<Thing>,size>,size>>空间;

和在构造函数初始化列表：

 世界（）{空间大小}
 

这至少应该让你编译和移动这一切堆。注意：这个最好是一个64位的过程。我将不得不打猎找出为什么G ++是做什么的，我怀疑它在做什么。

I need to initialize a very large multidimensional std::array of data:

class Thing;

class World
{
public:
    World() : space{nullptr} {};
    ~World() = default;
private:
    static unsigned int const size = 1000;
    std::array<std::array<std::array<std::unique_ptr<Thing>, size>, size>, size> space;
};

If you try to instantiate this, G++ 4.8.2 chokes: it consumes all the available memory and will not return. That is, the compiler hangs and I never get an executable. Why is this? Note that clang++ has no trouble.

Note: I fully realize that putting this much data on the stack can overflow it. What is the best way to initialize it on the heap? I think making space a reference (to allocated memory) would be the best way, but I can't figure the syntax out.

解决方案

Ok, i can't explain the nuance of why g++ is puking on this, but until you work that out, consider this for your member declaration:

std::vector<std::array<std::array<std::unique_ptr<Thing>,size>,size>> space;

and in the constructor initializer list:

World() : space{size}

That should at least get you compiling and move all this to the heap. Note: this better be a 64bit process. I'm going to have to hunt to find out why g++ is doing what I suspect it is doing.

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