你好,我是雨乐! 今天我们聊点点的知识点typedef & using😁。 C语言支持类型别名typedef,显然,CPP也支持咯。不过自CPP11(也称之为Modern CPP)开始,引入了using关键字用以表示类型别名。 创建类型别名 typedef和using都可以创建类型别名,区别是在语法语义上的不同。 typedef的语法如下: 代码语言:jav
std::vector<char> data{1, 2, 3, 4, 5}; // C++11 API auto cpp11 = simdutf::autodetect_encoding(data.data(), data.size()); // C++20 API auto cpp20 = simdutf::autodetect_encoding(data); The span overloads use std::span for UTF-16 and UTF-32. For latin1, UTF-8, "bin...
其实在源文件（*.cpp）里面怎么 using 都是没关系的，因为 cpp 里的代码不影响到他人。甚至如果你的...
String^ s = "Most people don't know that the CLR is written in C++"; pin_ptr<Char> p = const_cast< interior_ptr<Char> >( PtrToStringChars(s)); Console::WriteLine(NativeCountVowels(p)); PtrToStringChars returns a const interior pointer, which you cast to a non-const interior pointe...
// functions_in_namespaces1.cpp// C2874 expectednamespaceB {inti;voidf(int);voidf(double); }voidg(){inti;usingB::i;// error: i declared twicevoidf(char);usingB::f;// ok: each f is a function} 在上面的示例中,using B::i语句会导致在g()函数中声明第二个int i。using B::f语...
它和一般形式有些区别,就是它加了个typename修饰,这是因为类ClassThree本身是个模板类,它的基类ClassType是个模板,这个typename和using其实没有什么关系。如果ClassType不是模板的话,这行代码就可以写成: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 ...
= 3) { std::cout << "Arguments are <socket mysqld> <connect_string cluster>.\n"; exit(-1); } // ndb_init must be called first ndb_init(); // connect to mysql server and cluster and run application { char * mysqld_sock = argv[1]; const char *connection_string = argv[2]...
[10]; int deptno = 10; EXEC SQL END DECLARE SECTION; void sql_error(char *msg); main() { // Call sql_error() function on any error // in an embedded SQL statement EXEC SQL WHENEVER SQLERROR DO sql_error("Oracle error"); // Save text of SQL current statement in // the ORACA...
char PPasswd[256]; char VPasswd[256]; // Get uid, passwd for both virtual // & physical objects if(hr==GXE_SUCCESS) hr=pV->GetUid(&VUid); if(hr==GXE_SUCCESS) hr=pV->GetPasswd(VPasswd, 256); if(hr==GXE_SUCCESS) ...
// our server class class time_based_job : boost::noncopyable { public: int operator()() { return 0; } }; // main int main(int argc, char *argv[]) { time_based_job app; return 0; } 2. Context and Aspects Boost.Application has a concept of ‘aspects’ to allow easy extensio...