字符串连接比较(std::unique_ptr实现)

比较代码之间可能相差大，可是速度相差很大,而且目的在于测试unique_ptr使用...;

C/C++:

 #include <iostream>

 std::unique_ptr<char[]> strcat_test(std::initializer_list<const char *> li)
 {
     std::size_t size{};
     std::for_each(li.begin(), li.end(), [&size](const char *str)
     { size += strlen(str); });

     std::unique_ptr<char[]> uniq_char(new char[size + ]);
     char *temp = uniq_char.get();

     std::for_each(li.begin(), li.end(), [&temp](const char *str)
     {
         std::size_t size=strlen(str);
         memcpy(temp, str, size);
         temp += size;
     });

     temp[size] = '\0';

     return uniq_char;
 }

 int main()
 {

     std::size_t times=;

     std::clock_t start=,end=;

     start=clock();
     for(int i=;i<times;i++)
     {
         strcat_test({"Hello"," World","dasd","asdasdasd","adadad"});
     }
     end=clock();

     std::cout<<(double(end-start)/CLOCKS_PER_SEC)<<std::endl;

     start=clock();
     for(int i=;i<times;i++)
     {
         char str[]{"Hello"};
         strcat(str,"World");
     }
     end=clock();

     std::cout<<(double(end-start)/CLOCKS_PER_SEC)<<std::endl;

     return ;
 }

运行结果: