stl“向量< T>太长“ [英] stl "vector<T> too long"

问题描述

我在其他答案中读到，没有c ++编译器强加的限制 std :: vector的最大大小。我试图使用向量为一个目的，并需要有10 ^ 19项。

i read in other answers that theres no limit imposed by c++ compiler maximum size of std::vector. i am trying to use vector for one purpose, and in need to have 10^19 items.

typedef struct{
  unsigned long price, weight;
}product;


//inside main
unsigned long long n = 930033404565174954;
vector<product> psorted(n);

程序在最后一条语句中断开。如果我尝试 resize（n）而不是用 n 初始化，然后也有程序中断与消息：

the program breaks on the last statement. if i try resize(n) instead of initializing with n then also program breaks with message :

vector<T> too long
std::length_error at memory location

我需要对数据进行排序价格后放入矢量。我应该怎么办？

i need to sort the data accourding to price after putting in vector. what should i do ?

推荐答案

std :: vector 对于可以携带的东西有限制。您可以使用 std :: vector :: max_size 查询此值，它返回您可以使用的最大大小。

std::vector does have limits on how much stuff it can carry. You can query this with std::vector::max_size, which returns the maximum size you can use.

10 ^ 19项。

10^19 items.

你有 10 ^ 19 * sizeof产品）内存？我猜你没有〜138 Exa 字节的RAM。此外，你必须在64位模式下编译，甚至考虑分配这么多。编译器没有打破;你的执行打破了尝试分配太多东西。

Do you have 10^19 * sizeof(product) memory? I'm guessing that you don't have ~138 Exabytes of RAM. Plus, you'd have to be compiling in 64-bit mode to even consider allocating that much. The compiler isn't breaking; your execution is breaking for trying to allocate too much stuff.

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