the standards committee is wise, and move semantics has been added to the standard library. This means that you can now efficiently return vectors, maps, strings and whatever other
return 0; } unique_ptr 和 auto_ptr用法很相似,不过不能使用两个智能指针赋值操作,应该使用std::move; 而且它可以直接用if(ptest == NULL)来判断是否空指针;release、get、reset等用法也和auto_ptr一致,使用函数的返回值赋值时,可以直接使用=, 这里使用c++11 的移动语义特性。另外注意的是当把它当做参数传递...
std; using namespace rapidjson; int main() { string json = "{ \"hello\": \"world\", \"t\": true, \"f\": false, \"n\": null, \"i\": 123, \"pi\": 3.1416, \"a\": [1, 2, 3, 4] }"; Document document; document.Parse(json.c_str()); cin.get(); return 0; }...
随着C++11标准的发布,CRTP(Curiously Recurring Template Pattern,奇异递归模板模式)在C++程序设计中得到了新的发展。C++11引入了多项新特性,如移动语义(Move Semantics)、Lambda表达式和类型推导(Type Inference),这些都为CRTP的应用提供了更广阔的平台。 例如,移动语义允许我们更高效地处理临时对象,这在CRTP模式中尤其有...
由于我们还没讲到移动语义的实现,因此这里先假设MyClass类已经实现了移动语义。我们改动的是最后一行代码,由于我们不再需要tmp对象,因此通过使用std::move函数,我们让myClasses容器直接转移tmp对象的数据为已用,而不再需要执行拷贝操作了。 通过数据转移,我们避免了一次拷贝操作,最终内存中的数据如图所示: ...
Move Semantics and Perfect Forwarding in C++11:http://www.codeproject.com/Articles/397492/Move-Semantics-and-Perfect-Forwarding-in-Cplusplus http://solarianprogrammer.com/categories/C++11/ C++11 Concurrency:http://www.baptiste-wicht.com/2012/03/cpp11-concurrency-part1-start-threads/ ...
Move semantics Modern C++ providesmove semantics, which make it possible to eliminate unnecessary memory copies. In earlier versions of the language, copies were unavoidable in certain situations. Amoveoperation transfers ownership of a resource from one object to the next without making a copy. Some...
Compiler warning (level 1) C4715 'function': not all control paths return a value Compiler warning (level 1, error) C4716 'function': must return a value Compiler warning (level 1) C4717 'function': recursive on all control paths, function will cause runtime stack overflow Compiler warning...
int compare(s1, s2) char *s1, *s2; { while(*s1++ == *s2){ if(*s2++ == 0) return(0); } return (*--s1 - *s2); } Bourne Shell的影响远远超出了贝尔实验室的范围,这也使得这种类似Algol-68的C语言变体名声大噪。但是,有些C程序员对此感到不满。他们抱怨这种记法使别人难以维护代码。时...
If no server is running, it should return NATS_NOT_YET_CONNECTED. s = natsConnection_Connect(&conn, opts); printf("natsConnection_Connect call returned: %s\n", natsStatus_GetText(s)); // Connection can be used to create subscription and publish messages (as // long as the reconnect ...