错误:未解析的外部符号 [英] Error: Unresolved external Symbol

问题描述

你好，

我正在编写一段代码.我需要从一个在另一个类中声明的类访问变量.

例如:

Hello there,

I''m working on a piece of code. I need to access a variable from one class which is declared in another one.

For Example:

Class Sum
{
double time;
}

class Calc
{
static Sum ss; // reference to the Sum class
}

class Settings :: setup()
{
Calc:: ss.time 
}

为了获得该变量，我必须使sum成为静态，但是却收到一条错误消息，指出未解决的外部符号

I had to make sum static in order to aceess the variable but I get an error that says Unresolved external Symbol

public: static class Sum Geo::ss" (?ss@Geo.....bla bla)

推荐答案

static变量必须在源文件中定义(您仅提供了声明).例如，将变量定义放在class Calc 源文件(例如" calc.cpp ")中:

static variables must defined in a source file (you provided only the declaration). Put, for instance, in the class Calc source file (say "calc.cpp") the variable definition:

Sum Calc::ss;

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