在非成员函数中使用“this”无效 [英] Invalid use of 'this' in non-member function
问题描述
我在一个类上工作,并开始写同一个.cpp文件中的一切。然而,一段时间后,我可以看到类越来越大,所以我决定将它分为.h和.cpp文件。
I had working on a class and started writing everything in the same .cpp file. However, after a while I could see the class getting bigger and bigger so I decided to split it into a .h and a .cpp file.
gaussian.h档案:
gaussian.h file:
class Gaussian{
private:
double mean;
double standardDeviation;
double variance;
double precision;
double precisionMean;
public:
Gaussian(double, double);
~Gaussian();
double normalizationConstant(double);
Gaussian fromPrecisionMean(double, double);
Gaussian operator * (Gaussian);
double absoluteDifference (Gaussian);
};
gaussian.cpp文件:
gaussian.cpp file:
#include "gaussian.h"
#include <math.h>
#include "constants.h"
#include <stdlib.h>
#include <iostream>
Gaussian::Gaussian(double mean, double standardDeviation){
this->mean = mean;
this->standardDeviation = standardDeviation;
this->variance = sqrt(standardDeviation);
this->precision = 1.0/variance;
this->precisionMean = precision*mean;
}
//Code for the rest of the functions...
double absoluteDifference (Gaussian aux){
double absolute = abs(this->precisionMean - aux.precisionMean);
double square = abs(this->precision - aux.precision);
if (absolute > square)
return absolute;
else
return square;
}
但是,我无法得到这个编译。我尝试运行:
However, I can't get this to compile. I try running:
g++ -I. -c -w gaussian.cpp
但我得到:
gaussian.cpp: In function ‘double absoluteDifference(Gaussian)’:
gaussian.cpp:37:27: error: invalid use of ‘this’ in non-member function
gaussian.h:7:16: error: ‘double Gaussian::precisionMean’ is private
gaussian.cpp:37:53: error: within this context
gaussian.cpp:38:25: error: invalid use of ‘this’ in non-member function
gaussian.h:6:16: error: ‘double Gaussian::precision’ is private
gaussian.cpp:38:47: error: within this context
为什么无法使用此?我使用它在fromPrecisionMean函数和编译。是因为该函数返回高斯吗?任何额外的解释将真正感谢,我尽量多学习尽可能多!谢谢!
Why can't I use this?? I am using it in the fromPrecisionMean function and that compiles. Is it because that function returns a Gaussian? Any extra explanation will be really appreciated, I am trying to learn as much as I can! Thanks!
推荐答案
您忘记了声明 absoluteDifference
$ c>高斯类。
You forgot to declare absoluteDifference
as part of the Gaussian
class.
更改:
double absoluteDifference (Gaussian aux){
到此:
double Gaussian::absoluteDifference (Gaussian aux){
侧面注意:通过引用传递而不是传递值可能更好:
Side Note: It might be better to pass by reference rather than by value:
double Gaussian::absoluteDifference (const Gaussian &aux){
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