c++

【面试题】实现memcpy函数

空扰寡人 提交于 2019-12-14 23:33:16
【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 面试中如问到memcpy的实现,那就要小心了,这里有陷阱。 先看下标准memcpy()的解释: void *memcpy(void *dst, const void *src, size_t n); //If copying takes place between objects that overlap, the behavior is undefined. 注意下面的注释,对于地址重叠的情况,该函数的行为是未定义的。 事实上所说的陷阱也在于此,自己动手实现memcpy()时就需要考虑地址重叠的情况。 另外

libmcrypt and MS Visual C++

帅比萌擦擦* 提交于 2019-12-14 04:27:18
问题 Has anyone tried using libmcrypt and visual c++? I was trying to use Crypto++ but it seems not fully compatible - and I need to decrypt data encrypted in PHP using linux libmcrypt. I found only cygwin version of libmcrypt but no .lib files or header. I'm using RIJNDAEL_128 - maybe there is easier

How does getline work with cin?

心已入冬 提交于 2019-12-14 04:26:22
问题 I feel like there are a lot of similar questions, so I'm really sorry if this is a duplicate. I couldn't find the answer to this specific question, though. I am confused as to how getline works when cin is passed to it, because my understanding is that it should be calling cin each time it is

Passing istream into a function

夙愿已清 提交于 2019-12-14 04:25:23
问题 I am making a game-type program similar to the idea of pokemon. We have a tournament class that keeps track of several teams(its own class) which consists of pets(its own class) with different kinds of pets being subclasses of CPet. We are attempting to pass a file name into main, from main pass

_bstr_t memory leak

半世苍凉 提交于 2019-12-14 04:25:16
问题 I have a c++ code. But it is not releasing memory properly. Tell me where I am wrong, here is my code 1 void MyClass::MyFunction(void) 2 { 3 for (int i=0; i<count; i++) 4 { 5 _bstr_t xml = GetXML(i); 6 // some work 7 SysFreeString(xml); 8 } 9 } GetXML (line 5) returns me a BSTR. At this memory of