C vs C性能(用于处理短字符串)

我的测试结果是here.虽然有人坚持我的测试是完全错误的,但C比C慢110％;(

最近,Bjarne Stroustrup写了Five Popular Myths about C++

在他的文章中,他用C和C实现了一个函数

C版

string compose(const string& name,const string& domain)
{
  return name+'@'+domain;
}

C版

char* compose(const char* name,const char* domain)
{
  char* res = malloc(strlen(name)+strlen(domain)+2); // space for strings,'@',and 0
  char* p = strcpy(res,name);
p += strlen(name);
  *p = '@';
  strcpy(p+1,domain);
  return res;
}

最后他提到：

which version is likely to be the most efficient? Yes,the C++ version,because it does not have to count the argument characters and does not use the free store (dynamic memory) for short argument strings.

这是正确的吗？虽然C版本比C版本短,但我认为std :: string的operator()类似于C版本.