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c++编译错误:invalid new-expression of abstract class type - c++1y / s...

...,这样才能new 子类。 纯虚函数例如  void fun() = 0; 是纯虚函数,不是纯虚函数不作要求。 另外,void fun()  {  }  空函数体也是实现。 纯虚函数相当于C#中abstract抽象类。 =0 说明函数是抽象...
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mongodb 以管理员登录并创建 database - 人工智能(AI) - 清泛IT社区,为创新赋能!

...MongoServer server = MongoServer.Create("mongodb://root:111@192.168.0.34:27017/?connect=direct;slaveOk=true"); MongoServer server = MongoServer.Create("mongodb://root(admin):111@192.168.0.34:27017/?connect=ReplicaSet;slaveOk=true"); 是在以下找到的,用的关键字 "Mon...
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Discuz与phpsso整合时无法同步登录:通过js load 另一个 script 文件导致的...

...会卡死,建议改用:document.getElementsByTagName("head")[0].appendChild(s);复制代码 //解决二次<script>不执行的问题 function format_dom($urls) {         $output = 'var s = document.createElement("script");s.setAttribute("type...
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C++程序结果出现1.#inf 1.#IO - C/C++ - 清泛IT论坛,有思想、有深度

表象原因:浮点数越界了(超过FLT_MAX最大值了),1.#IO是 %lf 格式化出来的字符串。 极可能原因:除0了,也就是f1 = f2 / 0。 做任何除法时,分母为零的判断不可少。
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MFC Telnet Application(mfc telnet 端口,代码实现、不调用telnet.exe) ...

...码工程升级后,可能出现编译不过的情况,请将stdafx.h中0x0410全部改为0x0501即可。The article demonstrates an MFC GUI Telnet application with server capabilities for incoming connections support. Download demo - 29.9 KB Download source - 42.1 KB Introduction I've d...
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gdb打印c++ std::vector元素内容 - C/C++ - 清泛网 - 专注C/C++及内核技术

...容,不限gcc版本: (gdb) p *(vec._M_impl._M_start)@3 $1 = {5, 2, 0} (gdb) p *(vec._M_impl._M_start+0) $2 = 5 (gdb) p *(vec._M_impl._M_start+1) $3 = 2 vector的大小貌似只能尝试指定,不能动态计算。gdb vector
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MFC Telnet Application(mfc telnet 端口,代码实现、不调用telnet.exe) ...

...码工程升级后,可能出现编译不过的情况,请将stdafx.h中0x0410全部改为0x0501即可。The article demonstrates an MFC GUI Telnet application with server capabilities for incoming connections support. Download demo - 29.9 KB Download source - 42.1 KB Introduction I've d...
https://www.tsingfun.com/it/cp... 

MFC Telnet Application(mfc telnet 端口,代码实现、不调用telnet.exe) ...

...码工程升级后,可能出现编译不过的情况,请将stdafx.h中0x0410全部改为0x0501即可。The article demonstrates an MFC GUI Telnet application with server capabilities for incoming connections support. Download demo - 29.9 KB Download source - 42.1 KB Introduction I've d...
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解决Scrapy警告:You do not have a working installation of the service_i...

...们可以直接通过命令行下载: pip install service_identity-17.0.0-py2.py3-none-any.whl 如果上面的方法没能解决问题,很大可能是有些包的版本不一样导致的,这个时候我们可以用下面这行代码来强制更新: pip install service_identity --for...
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MFC Telnet Application(mfc telnet 端口,代码实现、不调用telnet.exe) ...

...码工程升级后,可能出现编译不过的情况,请将stdafx.h中0x0410全部改为0x0501即可。The article demonstrates an MFC GUI Telnet application with server capabilities for incoming connections support. Download demo - 29.9 KB Download source - 42.1 KB Introduction I've d...