Question

我想使用C ++ 03在每个MPI节点上定义一个常量常量数组。 M_chunk_sizes定义了要传递给其他节点并且在运行时不会更改的矩阵的大小。

int* define_chunk_sizes( int S, int world) {

    int out[world];

    double quotient = static_cast<double> (S) / world;
    int maj = ceil(quotient);

    for (int i =0; i < world - 1; i++)
      out[i] = maj;

    out[world-1] = maj + (S - maj*world);

    return out;
}

int main() {
    const int M = 999; // rows
    int world_size = 4;
    const int* const M_chunk_sizes = define_chunk_sizes(M, world_size);
}

但是我得到一个warning: address of stack memory associated with local variable 'out' returned [-Wreturn-stack-address] return out;。

正确的做法是什么？

Answer 1

funciton local variables(stack varibales) will go out of scope and life once function returns. you have use dynamic memory management operators, so allocate memory to out using

new

and relase memory using

delete

once you done with it.

`const int * const int`函数初始化

1 个答案: