C++模板类的使用和继承

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定义一个类模板，注意两点：

1，类的定义前面使用关键词：template <class T>

2，函数的实现部分，在每个函数名的上一行也要加关键词template <class T>，并且在函数名后面添加<T>，例如

template <class T>ImageProcessor<T>::ImageProcessor(void){}

3，在main.cpp文件中要同时包含模板类的.h文件和.cpp文件。

如果要从一个类模板中继承产生新的类模板注意：

1，子类的头文件中要包含父类的.h文件和.cpp文件。

2，子类的定义中，父类的名称后面要加<T>

以下是一个例子，父类是一个处理图像的通用类，子类在此继承上继承，实现对图像的下采样功能。

模板类的基类为：imageprocessor.h

#pragma oncetemplate <class T>class ImageProcessor{protected:int input_size[4];T * input_data;int output_size[4];T * output_data;public:void setInputImageSize(int, int, int, int);void setInputData(T *);void setOutputImageSize(int, int, int, int);void getOutputImageSize(int []);void setOutputData(T *);bool validInputImageSize(void);bool validOutputImageSize(void);int getInputPixelPointerShift(int, int,int,int);int getOutputPixelPointerShift(int, int,int,int);T* getInputPixelPointer(int, int,int,int);T* getOutputPixelPointer(int, int,int,int);         T getInputPixelValue(int, int,int,int);void setOutputPixelValue(int, int,int,int,T);ImageProcessor(void);public:~ImageProcessor(void);};

.cpp文件为：imageprocessor.cpp

#pragma once#include "StdAfx.h"#include "ImageProcessor.h"#include "windows.h"#include <iostream>using namespace std;template <class T>ImageProcessor<T>::ImageProcessor(void){}template <class T>void ImageProcessor<T>::setInputImageSize(int h,int w,int d,int s){}template <class T>void ImageProcessor<T>::setInputData(T* p){}template <class T>void ImageProcessor<T>::setOutputImageSize(int h,int w,int d,int s){}template <class T>void ImageProcessor<T>::getOutputImageSize(int size[4]){}template <class T>void ImageProcessor<T>::setOutputData(T* p){}template <class T>bool ImageProcessor<T>::validInputImageSize(void){}template <class T>bool ImageProcessor<T>::validOutputImageSize(void){}template <class T>int ImageProcessor<T>::getInputPixelPointerShift(int x, int y,int z,int s){}template <class T>int ImageProcessor<T>::getOutputPixelPointerShift(int x, int y,int z,int s){}template <class T>T* ImageProcessor<T>::getInputPixelPointer(int x, int y,int z,int s){}template <class T>T* ImageProcessor<T>::getOutputPixelPointer(int x, int y,int z,int s){}template <class T>T ImageProcessor<T>::getInputPixelValue(int x, int y,int z,int s){}template <class T>void ImageProcessor<T>::setOutputPixelValue(int x, int y,int z,int s, T value){}template <class T>ImageProcessor<T>::~ImageProcessor(void){}

子类的.h文件为：ipDownSampler.h

#pragma once#include "imageprocessor.h"#include "imageprocessor.cpp"template <class T>class ipDownSampler :public ImageProcessor<T>{protected:double sample_rate[4];int interpolation_method;public:bool setDownSampleRate(double []);bool getDownSampledSize(void);bool validDownSampleRate(void);bool setInterpolationMethod(int);bool downSample();T getPixelValueByNearestInterpolation(double,double,double,int);T getPixelValueByBilinearInterpolation(double,double,double,int);ipDownSampler(void);public:~ipDownSampler(void);};

其.cpp文件为：ipDownSampler.cpp

#pragma once#include "StdAfx.h"#include "ipDownSampler.h"template <class T>bool ipDownSampler<T>::setDownSampleRate(double rate[4]){}template <class T>bool ipDownSampler<T>::getDownSampledSize(void){}template <class T>bool ipDownSampler<T>::validDownSampleRate(void){}template <class T>bool ipDownSampler<T>::setInterpolationMethod(int method){}template <class T>bool ipDownSampler<T>::downSample(){}template <class T>T ipDownSampler<T>::getPixelValueByNearestInterpolation(double x,double y ,double z,int s){}template <class T>T ipDownSampler<T>::getPixelValueByBilinearInterpolation(double x,double y ,double z,int s){}template <class T>ipDownSampler<T>::ipDownSampler(void){}template <class T>ipDownSampler<T>::~ipDownSampler(void){}

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