2.10. 练习

You can buy solutions to all exercises in this book as a ZIP file.

• 使用适当的智能指针优化下面的程序：

#include <iostream> 
#include <cstring> 
 
char *get(const char *s) 
{ 
  int size = std::strlen(s); 
  char *text = new char[size + 1]; 
  std::strncpy(text, s, size + 1); 
  return text; 
} 
 
void print(char *text) 
{ 
  std::cout << text << std::endl; 
} 
 
int main(int argc, char *argv[]) 
{ 
  if (argc < 2) 
  { 
    std::cerr << argv[0] << " <data>" << std::endl; 
    return 1; 
  } 
 
  char *text = get(argv[1]); 
  print(text); 
  delete[] text; 
} 

• 下载源代码
  • 优化下面的程序：

#include <vector> 
 
template <typename T> 
T *create() 
{ 
  return new T; 
} 
 
int main() 
{ 
  std::vector<int*> v; 
  v.push_back(create<int>()); 
} 

• 下载源代码