_cast<A*>(this), this){}};structBase{virtual~Base(){}};structDerived:Base{virtualvoidname(){}};intmain(){D d;// 最终派生对象A&a=d;// 向上转换,可以用 dynamic_cast,但不是必须的[[maybe_unused]]D&new_d=dynamic_cast<D&>(a);// 向下转换[[maybe_unused]]B&new_b=dynamic_cast<...
dynamic_cast 在继承层级中转换 const_cast 添加或移除 cv 限定符 reinterpret_cast 转换类型到无关类型 C 风格转换 以static_cast、const_cast 及reinterpret_cast 的混合转换一个类型到另一类型 new 创建有动态存储期的对象 delete 销毁先前由 new 表达式创建的对象,并释放其所拥有的内存区域 sizeof 查询类型的大...
dynamic_cast and polymorphic typeid in constant expressions P1327R1 10 9 19.29 (16.10)* 11.0.3* 5.1 2021.1 20.7 12.0 11.0 Changing the active member of a union inside constexpr [FTM]* P1330R0 9 9 19.10* 11.0.3* 5.1 2021.1 20.7 12.0 11.0 Coroutines [FTM]* P0912R5 10 8 (partial...
5.4 Explicit type conversion (cast notation) [expr.cast] See also const_castconversionadds or removes const static_castconversionperforms basic conversions dynamic_castconversionperforms checked polymorphic conversions reinterpret_castconversionperforms general low-level conversions ...
2) 纯右值表达式不能是多态的[polymorphic]:纯右值表达式标识对象的动态型别总是表达式的型别。[the dynamic type of the object it identifies is always the type of the expression. ] 3) 非类[non-class]的纯右值不能被const或volatile关键字标识[cv-qualified]。
C++ keyword:const_cast C++ C++ language if switch for while continue-break goto-return decltype auto constexpr consteval constinit --nullptr static_cast const_cast dynamic_cast reinterpret_cast explicit static Keywords Usage const_casttype conversion expression: as the declaration of the expression ...
static_cast conversion dynamic_cast conversion reinterpret_cast conversion C-Stil und funktionale Besetzung Speicherzuweisung Original: Memory allocation The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. new ...
C++ keyword:reinterpret_cast C++ C++ language if switch for while continue-break goto-return decltype auto constexpr consteval constinit --nullptr static_cast const_cast dynamic_cast reinterpret_cast explicit static Keywords Usage reinterpret_casttype conversion expression: as the declaration of the expre...
if( x < 0 ) break; cout << x << endl; x++; } break语句只能跳出本层循环,假如你要跳出一个三重嵌套的循环,你就要使用包含其它的逻辑或者用一个goto语句跳出这个嵌套循环. case 在switch里面用来检测匹配 . default,switch catch catch 语句通常通过throw语句捕获一个异常. ...
std::bad_cast This can be thrown by dynamic_cast. std::bad_exception This is useful device to handle unexpected exceptions in a C++ program. std::bad_typeid This can be thrown by typeid. std::logic_error An exception that theoretically can be detected by reading the code. std::domain_...