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 + 1]);
    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] = '';

    return uniq_char;
}


int main()
{

    std::size_t times=10000;


    std::clock_t start=0,end=0;

    start=clock();
    for(int i=0;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=0;i<times;i++)
    {
        char str[11]{"Hello"};
        strcat(str,"World");
    }
    end=clock();

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



    return 0;
}

运行结果: