值类型(value categories) 每一个C++表达式(带有运算对象[operand]的运算符、字面值[literal]、变量名等)都是由两个独立的属性(properties) ——— 型别[type]和值类型[value categories] ——— 来描述[characterized]的。每一个表达式都有某些非引用类型[non-reference type],并且每一个表达式都明确地属于下面三...
This sample shows how to access a type's default indexer in both reference and value types.复制 // semantics_of_this_pointer.cpp // compile with: /clr using namespace System; ref struct A { property Double default[Double] { Double get(Double data) { return data*data; } } A() { ...
ndt::type view_type::with_replaced_storage_type(constndt::type& replacement_type)const{if(m_operand_type.get_kind() == expression_kind) {returnndt::type(newview_type(m_value_type,static_cast<constbase_expression_type *>(m_operand_type.extended())->with_replaced_storage_type(replacement_t...
Reference types are about identity – what kind of object is it? For this reason, "reference types" are also referred to as "polymorphic types".If you really want a reference-like type (base class, virtual functions), you need to explicitly disable copying, as shown in the MyRefType ...
a cast expression to non-reference type, such asstatic_cast<double>(x),std::string{}, or(int)42; thethispointer; anenumerator; a non-typetemplate parameterof a scalar type; template<intv>voidfoo(){// not an lvalue, `v` is a template parameter of scalar type intconstint*a=&v;//...
reference is closely related to the rules for evaluating expressions in C++, especially for argument of functions. It's about when the arguments to a function are evaluated, when they are substituted into the function, and what form that substitution takes. ...
// named-reference.cpp // Compile with: /EHsc #include <iostream> using namespace std; // A class that contains a memory resource. class MemoryBlock { // TODO: Add resources for the class here. }; void g(const MemoryBlock&) { cout << "In g(const MemoryBlock&)." << endl; } ...
// named-reference.cpp// Compile with: /EHsc#include<iostream>usingnamespacestd;// A class that contains a memory resource.classMemoryBlock{//TODO:Add resources for the class here.};voidg(constMemoryBlock&){cout<<"In g(const MemoryBlock&)."<<endl; }voidg(MemoryBlock&&){cout<<"In g...
A type that represents the type of element stored in a valarray.Copy typedef Type value_type; RemarksThe type is a synonym for the template parameter Type.ExampleCopy // valarray_value_type.cpp // compile with: /EHsc #include <valarray> #include <iostream> int main( ) { using name...
a cast expression to lvalue reference type, such as static_cast<int&>(x); a function call or an overloaded operator expression of rvalue reference to function return type; (C++ 11 类里面的指定左值返回类型的成员函数(即 class{ void fun()&; },fun是左值)) ...