文章目錄

• • 13.1.4節目練習
  • 13.2節練習
  • 13.2.2練習

13.1.4節目練習

練習13.14

#include <iostream> using namespace std;class numbered { private: static int seq; public:numbered() { mysn = seq++; }int mysn; };int numbered::seq = 0;void f(numbered s) { cout << s.mysn << endl; }int main() {numbered a, b = a, c = b;f(a);f(b);f(c); }

練習13.15

#include <iostream> using namespace std;class numbered { private:static int seq; public:numbered() { mysn = seq++; }numbered(const numbered &n ) { mysn = seq++; }int mysn; };int numbered::seq = 0;void f(numbered s) {cout << s.mysn << endl; }int main() {numbered a, b = a, c = b;f(a);f(b);f(c); }

練習13.15

#include <iostream> using namespace std;class numbered { private:static int seq; public:numbered() { mysn = seq++; }numbered(const numbered &n ) { mysn = seq++; }int mysn; };int numbered::seq = 0;void f(numbered &s) {cout << s.mysn << endl; }int main() {numbered a, b = a, c = b;f(a);f(b);f(c); }

13.2節練習

#include <string>class HasPtr { public:HasPtr(const std::string &s = std::string()) : ps(new std::string(s)), i(0) {}HasPtr(const HasPtr &hp) : ps(new std::string(*hp.ps)), i(hp.i) {}HasPtr& operator=(const HasPtr &hp) {auto new_p = new std::string(*hp.ps);delete ps;ps = new_p;i = hp.i;return *this;}~HasPtr() { delete ps;} private:std::string *ps;int i; };

13.2.2練習

• 練習13.27

#include <string>class HasPtr { public:HasPtr(const std::string& s = std::string()) : ps(new std::string(s)), i(0), use(new size_t(1)) {}HasPtr(const HasPtr& hp) : ps(hp.ps), i(hp.i), use(hp.use) { ++* use; }HasPtr& operator=(const HasPtr& rhs); private:std::string* ps;int i;size_t* use; };HasPtr& HasPtr::operator=(const HasPtr& rhs) {++* rhs.use;if (-- * use == 0){delete ps;delete use;}ps = rhs.ps;i = rhs.i;use = rhs.use;return *this; } 創作挑戰賽新人創作獎勵來咯，堅持創作打卡瓜分現金大獎

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