cppreference Constructors and member initializer lists

Delegating constructor (since C++11)

NOTE: 关于delegate，参见Theory\Programming-paradigm\Object-oriented-programming\Assemble\Composition\Delegation

TODO:

https://www.geeksforgeeks.org/constructor-delegation-c/

#include <iostream>
class Foo
{
public:
    Foo(char x, int y)
    {
        std::cout << __PRETTY_FUNCTION__ << std::endl;
    }
    Foo(int y)
            : Foo('a', y) // Foo(int) delegates to Foo(char,int)
    {
        std::cout << __PRETTY_FUNCTION__ << std::endl;
    }
};

int main()
{
    Foo f(1);
}
// g++ --std=c++11 test.cpp

NOTE: 上述程序的输出如下:

Foo::Foo(char, int)
Foo::Foo(int)

Initialization order

NOTE: 这部分内容移到了Initialization-and-deinitialization-order章节

Summary

Classification of constructor：

• default constructor
• copy constructor
• move constructor

对于上述每种constructor，都涉及如下问题：

问题	说明
implicitly-declared and Implicitly-defined
default	If some user-defined constructors are present, the user may still force the automatic generation of a default constructor by the compiler that would be implicitly-declared otherwise with the keyword default. (since C++11)
delete	Deleted constructor.