C ++中的静态结构 [英] Static struct in C++

问题描述

我想定义一个结构，其中会存储一些数学常数。

现在我已经有了：

I want to define an structure, where some math constants would be stored.
Here what I've got now:

struct consts {
    //salt density kg/m3
   static const double gamma;
};

const double consts::gamma = 2350;

它工作正常，但会有超过10个浮点常数，因此我不想在每个人之前写static const。并定义如下：

It works fine, but there would be more than 10 floating point constants, so I doesn't want to wrote 'static const' before each of them. And define something like that:

static const struct consts {
    //salt density kg/m3
   double gamma;
};

const double consts::gamma = 2350;

看起来不错，但我遇到了这些错误：

1.成员函数不允许重新声明

2.非静态数据成员不能在其类之外定义

It look fine, but I got these errors:
1. member function redeclaration not allowed
2. a nonstatic data member may not be defined outside its class

我想知道是否有任何C ++方法？ / p>

I wondering if there any C++ way to do it?

推荐答案

使用命名空间，而不是试图将结构体变成命名空间。

Use a namespace rather than trying to make a struct into a namespace.

namespace consts{
    const double gamma = 2350;
}

访问数据的方法也有完全相同的synatx。例如：

The method of accessing the data also has exactly the same synatx. So for example:

double delta = 3 * consts::gamma;

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