示例：1.指针类型转换：#include<iostream>usingnamespacestd;intmain(){intx=42;void*ptr=&x;// 把 int 指针转成 void 指针// 使用 reinterpret_cast 把 void 指针转回 int 指针int*intPtr=reinterpret_cast<int*>(ptr);cout<<"通过 reinterpret_c
代码语言:cpp 复制 #include<iostream>intmain(){intx=10;int*ptr_x=reinterpret_cast<int*>(x);// 将整数转换为指针类型std::cout<<"Value of x: "<<*ptr_x<<std::endl;// 输出指针所指向的值char*ptr_y=reinterpret_cast<char*>(&x);// 将整数指针转换为字符指针类型std::cout<<"Value of ...
QString::fromUtf8 ( const char * str, int size = -1 ); QString::fromUtf16 ( const ushort * unicode, int size = -1 ); QString::fromWCharArray ( const wchar_t * string, int size = -1 ); //qstring ->std::string QString::toStdString () ; QString::toStdWString (); //...
QString::fromUtf8 ( const char * str, int size = -1 ); QString::fromUtf16 ( const ushort * unicode, int size = -1 ); QString::fromWCharArray ( const wchar_t * string, int size = -1 ); //qstring ->std::string QString::toStdString () ; QString::toStdWString (); //...
::dynamic_pointer_cast(service); } }; 我们抽出一个非模板的函数getService(const std::string &key),将加锁、查询 map...std::dynamic_pointer_cast(): 这里主要是将基类指针动态地转换为子类指针,可抽象出接口castToOriginType(),在里面进行类型转换,返回一个void类型的指针。...return std::dynamic_poi...
(Vtestrunner__Syms*, std::string, Vtestrunner_filter_expression_parts__struct__0&)’: Vtestrunner_svunit_pkg__03a__03afilter__Vclpkg__DepSet_h2ac5c5c3__0.cpp:64:36: error: invalid cast from type ‘std::__cxx11::basic_string<char>’ to type ‘QData’ {aka ‘long unsigned int’...
// static_cast_Operator_3.cpp// compile with: /LD /GRtypedefunsignedcharBYTE;voidf(){charch;inti =65;floatf =2.5;doubledbl; ch =static_cast<char>(i);// int to chardbl =static_cast<double>(f);// float to doublei =static_cast<BYTE>(ch); } ...
// safe_cast_ZW.cpp// compile with: /ZW /EHscusingnamespacedefault;usingnamespacePlatform; interfaceclassI1{}; interfaceclassI2{}; interfaceclassI3{}; refclassX:publicI1,publicI2 {};intmain(Array<String^>^ args){ I1^ i1 = refnewX; I2^ i2 = safe_cast<I2^>(i1);// OK, ...
1. static_cast(expression) The static_cast<>() is used to cast between the integer types. 'e.g.' char->long, int->short etc. 用来数值之间的转化。 2. 可以在相关指针之间转换,指针在void * 之间转换,还可以在基类和派生类之间转换。 这些转换是在编译的时候就确定下来转换(无非就是根据继承关系...
#include <iostream>#include <string>class Base {public:virtual ~Base() {}};class Derived : public Base {public:void print() { std::cout << "Derived\n"; }};int main() {Base* base = new Derived();Derived* derived = dynamic_cast<Derived*>(base);if (derived) {derived->print();...