问题
I've read the similar questions, but the one that answers mine applies only to VisualStudio. I am using Eclipse and developing an Android application using Cocos2d-X, which is a framework that uses Android's NDK. I created a class named Config, which contains all of the application's constants such as ball sizes and fps. Below is how I arranged the code.
Config.h
#ifndef __CONFIG_H_ // this was auto-generated by eclipse
#define __CONFIG_H_
class Config {
public:
static const double GRAVITY;
static const int BALL_WIDTH;
static const int BALL_HEIGHT;
}
#endif /* config.h */
Config.cpp
#include "Config.h"
const double Config::GRAVITY = 9.8;
const int Config::BALL_WIDTH = 100;
const int Config::BALL_HEIGHT = 100;
It compiles without errors, but when it begins linking, I get the following error:
multiple definition of `Config::GRAVITY'
C:/workspace/cocos2d-x/SampleGame/android/obj/local/armeabi/objs-debug/game/../../../Classes/Config.o:(.rodata+0xc8): first defined here
C:/workspace/cocos2d-x/SampleGame/android/obj/local/armeabi/objs-debug/game/../../../Classes/Ball.o:(.rodata+0xcc):`
The previous error occurs for all the constants declared. I have not included Config.cpp in the source code of any of the reported source files.
I have no idea how to correct this. I found an extremely similar question, but the answer was specified towards Microsoft's VisualStudio. Also, I'm sorry for using the 'cocos2d' tag, even if this applies to cocos2d-X, but I'm hoping someone knows how to fix this.
回答1:
The only way that error could occur is if you're including the .cpp file around. Else, your code is perfectly Standards-compliant. After all, the error implies that the constant was defined in Ball.o
, which I find very unlikely unless you included the cpp.
回答2:
In your case, the names doesn't match. You are declaring as gravity
and in cpp it's GRAVITY
.
Edit: After your edit, I see no linking errors in your code unless you have defined GRAVITY
in your Ball.cpp/h
file also.
来源:https://stackoverflow.com/questions/6136536/c-static-const-multiple-declaration-error-in-eclipse-for-android-ndk