字段初始值不是常量g ++ 4.8.4 [英] field initializer is not constant g++ 4.8.4

问题描述

我尝试在我的笔记本电脑上使用g ++ 4.8.4编译以下代码：

  #include< algorithm> 
 #include< iostream> 
 #include< initializer_list> 
 #include< tuple> 
 
 struct存储{
 static const int num_spatial_subset = 8; 
 static constexpr std :: initializer_list< std :: initializer_list< double>>向量{{0,0,0}，
 {0,1,0}，
 {0,0,1}，
 {1,1,0}，
 {1,0,1}，
 {0,1,1}，
 {1,0,0}，
 {1,1,1}}; 
双存储[num_spatial_subset] [vectors.size（）]; 
}; 
 
 
 int main（）
 {
} 
  

我得到这个错误信息：

pre $ 错误：字段初始化器不是常量
constexpr std： ：initializer_list<的std :: initializer_list<双> >向量{{0,0,0}，{0,1,0}，{0,0,1}，{1,1,0}，{1,0,1}，{0,1,1}， {1,0,0}，{1,1,1}};


然而，我在












有人告诉我什么是错误的吗？

谢谢。

解决方案

实际上，正如克里斯和鲍姆指出的那样，更新到g ++ 4.9修复了它。

I tried to compile the following code on my laptop, using g++ 4.8.4:

#include <algorithm>
#include <iostream>
#include <initializer_list>
#include <tuple>

struct Storage {
  static const int num_spatial_subset = 8;
  static constexpr std::initializer_list<std::initializer_list<double>> vectors{ {0,0,0}, 
      {0,1,0}, 
      {0,0,1}, 
      {1,1,0}, 
      {1,0,1}, 
      {0,1,1}, 
      {1,0,0}, 
      {1,1,1} };
  double storage[num_spatial_subset][vectors.size()];
};


int main()
{
}

And I got this error message:

error: field initializer is not constant
constexpr std::initializer_list< std::initializer_list<double> > vectors{ {0,0,0}, {0,1,0}, {0,0,1}, {1,1,0}, {1,0,1}, {0,1,1}, {1,0,0}, {1,1,1} };

However, I copy/paste the same code on coliru (g++ 6.1.0), with the same compilation parameters and it worked.

Can someone tells me what is wrong please ?

Thank you.

解决方案

Actually, as pointed out by Chris and Baum, updating to g++ 4.9 fixed it.

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