C++ 11 新特性之Class

这是C++11新特性介绍的第六部分，涉及到Class的相关内容。

不想看toy code的读者可以直接拉到文章最后看这部分的总结。

sizeof

新标准中，sizeof可以直接用于获取Class::member的大小，而不用通过Class的实例。

class TestClass
{
public:
	int member_i;
	char member_c;
};

cout<<"test sizeof class member:\n"; cout<<sizeof(TestClass::member_i)<<"\t"<<sizeof(TestClass::member_c)<<endl;

default constructor

新标准中，可以通过=default强制编译器生成一个默认constructor。

class TestClass
{
public:
	TestClass() = default;
	TestClass(const int i, const char c): member_i(i), member_c(c) {} int member_i; char member_c; }; cout<<"test =default class construct:\n"; TestClass tc; // may cause error if no default construct. cout<<tc.member_i<<'\t'<<(short)tc.member_c<<endl; cout<<"test =default done."<<endl;

在上面的代码中，如果我们不提供默认constructor的话，无法通过TestClass tc定义一个实例。

delegate constructor

新标准中，可以在初始化列表中将一个constructor初始化的工作委托给另一个constructor。

class TestClass
{
public:
	TestClass() = default;
	TestClass(const int i, const char c): member_i(i), member_c(c) {} TestClass(const int i): TestClass(i, 0) { member_c = 'T';} int member_i; char member_c; }; cout<<"test delegating constructor:\n"; TestClass tc2(2); cout<<tc2.member_i<<'\t'<<tc2.member_c<<endl;

allocator.construct

新标准中，allocator.construct可以使用任意的构造函数。

class TestClass
{
public:
	TestClass() = default;
	TestClass(const int i, const char c): member_i(i), member_c(c) {} TestClass(const int i): TestClass(i, 0) { member_c = 'T';} int member_i; char member_c; }; cout<<"test allocator:\n"; allocator<TestClass> alloc; auto p = alloc.allocate(10); alloc.construct(p, 10); cout<<p->member_i<<'\t'<<p->member_c<<endl;

copy constructor

新标准中，可以通过=default要求编译器合成默认的拷贝/赋值构造函数。

class TestClass
{
public:
	TestClass() = default;
	TestClass(const int i, const char c): member_i(i), member_c(c) {} TestClass(const int i): TestClass(i, 0) { member_c = 'T';} TestClass(const TestClass&) = default; TestClass& operator=(const TestClass&); int member_i; char member_c; }; cout<<"test =default class copy construct:\n"; TestClass tc3(tc2); TestClass tc4 = tc2; cout<<tc3.member_i<<'\t'<<tc3.member_c<<endl; cout<<tc4.member_i<<'\t'<<tc4.member_c<<endl;

同样，新标准中也允许用=delete禁止拷贝。

class TestClass
{
public:
	TestClass() = default;
	TestClass(const int i, const char c): member_i(i), member_c(c) {} TestClass(const int i): TestClass(i, 0) { member_c = 'T';} TestClass(const TestClass&) = delete; TestClass& operator=(const TestClass&); int member_i; char member_c; }; TestClass& TestClass::operator=(const TestClass&) = default; cout<<"test =delete class copy construct:\n"; //TestClass tc5(tc2); // error: use of deleted function ‘TestClass::TestClass(const TestClass&)’ //cout<<tc5.member_i<<'\t'<<tc5.member_c<<endl; cout<<"test =delete done."<<endl;

override和final

新标准中提供了override和final两个关键字，用于标识子类对父类中虚函数的重写（override）或禁止重写（final）。

class TestClass
{
public:
	TestClass() = default;
	TestClass(const int i, const char c): member_i(i), member_c(c) {} TestClass(const int i): TestClass(i, 0) { member_c = 'T';} TestClass(const TestClass&) = default; TestClass& operator=(const TestClass&); virtual void print_msg() {cout<<member_i<<'\t'<<member_c<<endl;} virtual void final_foo() final {} int member_i; char member_c; }; TestClass& TestClass::operator=(const TestClass&) = default; class SubTestClass final: public TestClass { public: using TestClass::TestClass; SubTestClass(const int i): TestClass(i, 'S') {} void print_msg() override; //void print_msg(char c) override; //‘void SubTestClass::print_msg(char)’ marked override, but does not override //void final_foo() {} //overriding final function ‘virtual void TestClass::final_foo()’ }; //class SubSubTestClass: public SubTestClass {}; // cannot derive from ‘final’ base ‘SubTestClass’ in derived type ‘SubSubTestClass’ void SubTestClass::print_msg() { cout<<"i: "<<member_i<<'\t'<<"c: "<<member_c<<endl; } cout<<"test override:\n"; TestClass *stc_ptr = new SubTestClass(10); stc_ptr->print_msg(); SubTestClass stc(10); TestClass tc6 = (TestClass)stc; tc6.print_msg();

如果标识了override的函数实际上没有重写父类中的函数，或者标识final的函数被子类重写，编译器都会报错。

通样的，标识为final的类也不允许作为父类被继承。

委托父类构造函数

新标准中，也支持子类在初始化列表中直接委托父类的构造函数完成初始化。

class SubTestClass final: public TestClass
{
	public:
		using TestClass::TestClass;
		SubTestClass(const int i): TestClass(i, 'S') {} void print_msg() override; }; cout<<"test inherit base class contructor:\n"; SubTestClass stc2(1024, 'H'); stc2.print_msg();

多继承与默认constructor

多重继承的子类可以直接继承父类的构造函数，但是如果父类中有形参列表完全相同的构造函数，则会产生冲突，这时需要子类自己定义一个自己版本的构造函数。

class TestClass2
{
public:
	TestClass2() = default;
	TestClass2(const int i) {}
};

class MultiSubClass: public TestClass, public TestClass2 { public: using TestClass::TestClass; using TestClass2::TestClass2; // conflicts with version inherited from ‘TestClass’ MultiSubClass(const int i): TestClass(i) {} MultiSubClass() = default; }; cout<<"test multi inherit constructor:\n"; MultiSubClass mtc(1024); mtc.print_msg(); return 0;

总结

1. sizeof可以直接用于获取Class::member的大小，而不用通过Class的实例。
2. 可以通过=default强制编译器生成一个默认constructor。
3. 可以在初始化列表中将一个constructor初始化的工作委托给另一个constructor，以及父类的constructor。
4. allocator.construct可以使用任意的构造函数。
5. 可以通过=default要求编译器合成默认的拷贝/赋值构造函数，也可以通过=delete禁止拷贝。
6. 新标准中提供了override和final两个关键字，用于标识子类对父类中虚函数的重写（override）或禁止重写（final），编译会对这两种情况进行检查。final还可以用于类的标识，表示禁止继承。
7. 多重继承的子类可以直接继承父类的构造函数，但是如果父类中有形参列表完全相同的构造函数，则会产生冲突，这时需要子类自己定义一个自己版本的构造函数。

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