未定义的引用static constexpr char [] [] [英] Undefined reference to static constexpr char[][]

问题描述

我试图在类中的char char [] []静态公共字段，但在另一个函数这个字段是未定义的。我如何使用consexpr或存在另一个方法init static（字典）数组？

I tried to init char[][] static public field in class but in another function this field is undefined. How I use consexpr or exists another method to init static (dictionary) array?

class A {
    public:
        constexpr static char dict[][3] = {
            "a",
            "bb"
        };

        void print() {
            printf(A::dict[1]);
        }
};

int main() {
    A a;
    a.print();
    return 0;
}

10未定义引用`A :: dict'

10 undefined reference to `A::dict'

推荐答案

定义需要超出类，而初始化器属于类内。

The definition needs to go outside the class, while the initializer belongs inside the class.

constexpr char A::dict[][3];

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