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我正在尝试random在编译时使用C++ 11的库预先计算随机值.我主要是按照例子.我在这做错了什么？

using namespace std;
#include <iostream>
#include <vector>
#include <random>

vector<double> rands;
typedef std::mt19937_64 RNG;
uint64_t seed_val;
RNG rng; 

void initialize() {
     rng.seed(seed_val);
}

constexpr vector<double> generate_random( )                 //size_t numbers)
{   
    int numbers = 1000;
    std::uniform_real_distribution<double> zero_one(0.0, 1.0);
        for (unsigned int i = 0; i < numbers; i++) { 
             double rand_num = zero_one(rng);
             rands.push_back( rand_num );
    }
    return rands;
}

int main()
{
    cout << "TMP rands";
    for_each( rands.begin(), rands.end(), [] (double value)
    {
        cout<<value<<endl;
    });
} …