std::shared_ptr<T> static_pointer_cast( const std::shared_ptr<U>& r ) noexcept; (1) (since C++11) template< class T, class U > std::shared_ptr<T> static_pointer_cast( std::shared_ptr<U>&& r ) noexcept; (2) (since C++20) template< class T, class U > std::shared_ptr...
static_pointer_castdynamic_pointer_castconst_pointer_castreinterpret_pointer_cast (C++17) 应用static_cast、dynamic_cast、const_cast 或reinterpret_cast 到被存储指针 (函数模板) get_deleter 返回指定类型中的删除器,若其拥有 (函数模板) operator==operator!=operator<operator<=operator>operator>=operat...
No validstandard conversionfrom “pointer toDerived” to “pointer toBase” exists. Ifexpressionis actually not a base class subobject of an object of typeDerived, the behavior is undefined. structB{};structD:B{B b;};D d;B&br1=d;B&br2=d.b;static_cast<D&>(br1);// OK, lvalue deno...
static_pointer_castdynamic_pointer_castconst_pointer_castreinterpret_pointer_cast appliesstatic_cast,dynamic_cast,const_cast, orreinterpret_castto the stored pointer (function template) Helper classes std::hash<std::experimental::shared_ptr> hash support forstd::experimental::shared_ptr ...
pointer = new type; pointer = new type( initializer ); pointer = new type[size]; new可以给数据类型分配一个新结点并返回一个指向新分配内存区的首地址. 也可以对它进行初始化.中括号中的size可以分配尺寸大小. delete 语法: return-type class-name::operator#(parameter-list) { ...
#includeusing namespace std; templateT add(T lhs, T rhs) { return lhs + rhs; } int main() { cout << "1 + 2 =" << add(1, 2) << endl; cout << "1.0 + 2.0 = " << add(1.0, static_cast(2)) << endl; cout << "1.0 + 2.0 = " << add(1.0, 2) << endl; } ...
a cast expression to non-reference type, such as static_cast(x), std::string{}, or (int)42; the this pointer; (this指针也是纯右值,因为this也是一个地址) a lambda expression, such as [](int x){ return x * x; }.(since C++11) ...
4)a.*mp, 对象的成员指针表达式[the pointer to member of object expression]。其中,‘a’是右值,‘mp’是指向数据成员的指针。 5) a?b:c, a ? b : c, 对于某些a,b,c的三元条件表达式[ternary conditional expression]。 6) 强转为“对象的右值引用”表达式,比如,static_cast<char&&>(x)。
starting from 0 enum Day { MONDAY, // 0 TUESDAY, // 1 WEDNESDAY, // 2 THURSDAY, // 3 FRIDAY // 4 }; // assign an enumerator to an integer int x = THURSDAY; // can not directly assign an int to an enum variable Day day1 = static_cast<Day>(3); // day1 = 3 is ...
= static_cast<float>(lCurrentVertex[1]); lVertices[lIndex * VERTEX_STRIDE + 2] = static_cast<float>(lCurrentVertex[]); lVertices[lIndex * VERTEX_STRIDE + 3] = 1; // Save the normal. if (mHasNormal { int lNormalIndex = lIndex; if (lNormalElement->GetReferenceMode() =...