C++ 无效使用';这';在非成员函数中
我开始在一个类上工作,并开始在同一个.cpp文件中编写所有内容。然而,过了一段时间,我看到这个类越来越大,所以我决定把它分成一个.h和一个.cpp文件 gaussian.h文件:C++ 无效使用';这';在非成员函数中,c++,compiler-errors,this,non-member-functions,C++,Compiler Errors,This,Non Member Functions,我开始在一个类上工作,并开始在同一个.cpp文件中编写所有内容。然而,过了一段时间,我看到这个类越来越大,所以我决定把它分成一个.h和一个.cpp文件 gaussian.h文件: class Gaussian{ private: double mean; double standardDeviation; double variance; double precision; double precisionM
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:
#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
为什么我不能用这个??我在fromPrecisionMean函数中使用它,它编译。是因为这个函数返回一个高斯函数吗?任何额外的解释都将不胜感激,我正在尽可能多地学习!谢谢 您忘记将
绝对差异
声明为高斯
类的一部分
更改:
double absoluteDifference (Gaussian aux){
为此:
double Gaussian::absoluteDifference (Gaussian aux){
旁注:通过引用传递可能比通过值传递更好:
double Gaussian::absoluteDifference (const Gaussian &aux){
啊!!真不敢相信我竟然看不见!我经历了很多次。。。!非常感谢。
double Gaussian::absoluteDifference (const Gaussian &aux){