我一开始把所有的代码都写在同一个.cpp文件里，后来发现这个类变得越来越大，于是我决定把它分成.h和.cpp两个文件。
gaussian.h文件：
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);
};
高斯.cpp文件：
#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;
}
然而，我无法编译这个代码。我尝试运行：
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
为什么我不能使用这个？我正在fromPrecisionMean函数中使用它，而且那个编译了。是因为该函数返回一个高斯分布吗？如果能提供额外的解释，我将不胜感激，我正在尽我所能学习！谢谢！