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- // dma.h -- inheritance and dynamic memory allocation
- #ifndef DMA_H_
- #define DMA_H_
- #include <iostream>
- // Base Class Using DMA
- class baseDMA
- {
- private:
- char * label;
- int rating;
- public:
- baseDMA(const char * l = "null", int r = 0);
- baseDMA(const baseDMA & rs);
- virtual ~baseDMA();
- baseDMA & operator=(const baseDMA & rs);
- friend std::ostream & operator<<(std::ostream & os,
- const baseDMA & rs);
- };
- // derived class without DMA
- // no destructor needed
- // uses implicit copy constructor
- // uses implicit assignment operator
- class lacksDMA :public baseDMA
- {
- private:
- enum { COL_LEN = 40};
- char color[COL_LEN];
- public:
- lacksDMA(const char * c = "blank", const char * l = "null",
- int r = 0);
- lacksDMA(const char * c, const baseDMA & rs);
- friend std::ostream & operator<<(std::ostream & os,
- const lacksDMA & rs);
- };
- // derived class with DMA
- class hasDMA :public baseDMA
- {
- private:
- char * style;
- public:
- hasDMA(const char * s = "none", const char * l = "null",
- int r = 0);
- hasDMA(const char * s, const baseDMA & rs);
- hasDMA(const hasDMA & hs);
- ~hasDMA();
- hasDMA & operator=(const hasDMA & rs);
- friend std::ostream & operator<<(std::ostream & os,
- const hasDMA & rs);
- };
- #endif
- // dma.cpp --dma class methods
- #include "dma.h"
- #include <cstring>
- // baseDMA methods
- baseDMA::baseDMA(const char * l, int r)
- {
- label = new char[std::strlen(l) + 1];
- std::strcpy(label, l);
- rating = r;
- }
- baseDMA::baseDMA(const baseDMA & rs)
- {
- label = new char[std::strlen(rs.label) + 1];
- std::strcpy(label, rs.label);
- rating = rs.rating;
- }
- baseDMA::~baseDMA()
- {
- delete [] label;
- }
- baseDMA & baseDMA::operator=(const baseDMA & rs)
- {
- if (this == &rs)
- return *this;
- delete [] label;
- label = new char[std::strlen(rs.label) + 1];
- std::strcpy(label, rs.label);
- rating = rs.rating;
- return *this;
- }
- std::ostream & operator<<(std::ostream & os, const baseDMA & rs)
- {
- os << "Label: " << rs.label << std::endl;
- os << "Rating: " << rs.rating << std::endl;
- return os;
- }
- // lacksDMA methods
- lacksDMA::lacksDMA(const char * c, const char * l, int r)
- : baseDMA(l, r)
- {
- std::strncpy(color, c, 39);
- color[39] = ‘\0';
- }
- lacksDMA::lacksDMA(const char * c, const baseDMA & rs)
- : baseDMA(rs)
- {
- std::strncpy(color, c, COL_LEN - 1);
- color[COL_LEN - 1] = ‘\0';
- }
- std::ostream & operator<<(std::ostream & os, const lacksDMA & ls)
- {
- os << (const baseDMA &) ls;
- os << "Color: " << ls.color << std::endl;
- return os;
- }
- // hasDMA methods
- hasDMA::hasDMA(const char * s, const char * l, int r)
- : baseDMA(l, r)
- {
- style = new char[std::strlen(s) + 1];
- std::strcpy(style, s);
- }
- hasDMA::hasDMA(const char * s, const baseDMA & rs)
- : baseDMA(rs)
- {
- style = new char[std::strlen(s) + 1];
- std::strcpy(style, s);
- }
- hasDMA::hasDMA(const hasDMA & hs)
- : baseDMA(hs) // invoke base class copy constructor
- {
- style = new char[std::strlen(hs.style) + 1];
- std::strcpy(style, hs.style);
- }
- hasDMA::~hasDMA()
- {
- delete [] style;
- }
- hasDMA & hasDMA::operator=(const hasDMA & hs)
- {
- if (this == &hs)
- return *this;
- baseDMA::operator=(hs); // copy base portion
- delete [] style; // prepare for new style
- style = new char[std::strlen(hs.style) + 1];
- std::strcpy(style, hs.style);
- return *this;
- }
- std::ostream & operator<<(std::ostream & os, const hasDMA & hs)
- {
- os << (const baseDMA &) hs;
- os << "Style: " << hs.style << std::endl;
- return os;
- }
- // usedma.cpp -- inheritance, friends, and DMA
- // compile with dma.cpp
- #include <iostream>
- #include "dma.h"
- int main()
- {
- using std::cout;
- using std::endl;
- baseDMA shirt("Portabelly", 8);
- lacksDMA balloon("red", "Blimpo", 4);
- hasDMA map("Mercator", "Buffalo Keys", 5);
- cout << "Displaying baseDMA object:\n";
- cout << shirt << endl;
- cout << "Displaying lacksDMA object:\n";
- cout << balloon << endl;
- cout << "Displaying hasDMA object:\n";
- cout << map << endl;
- lacksDMA balloon2(balloon);
- cout << "Result of lacksDMA copy:\n";
- cout << balloon2 << endl;
- hasDMA map2;
- map2 = map;
- cout << "Result of hasDMA assignment:\n";
- cout << map2 << endl;
- return 0;
- }
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