C++核心准则C.47:按照成员变量声明的次序定义和初始化数据成员

C.47: Define and initialize member variables in the order of member declaration

C.47:按照成员变量声明的次序定义和初始化数据成员

Reason（原因）

To minimize confusion and errors. That is the order in which the initialization happens (independent of the order of member initializers).

最大限度降低混淆和错误。这（声明的次序，译者注）是初始化执行的顺序（和成员初始化器的顺序无关）

Example, bad（反面示例）

class Foo {
 ? ?int m1;
 ? ?int m2;
public:
 ? ?Foo(int x) :m2{x}, m1{++x} { } ? // BAD: misleading initializer order
 ? ?// ...
};

Foo x(1); // surprise: x.m1 == x.m2 == 2

Enforcement（实施建议）

(Simple) A member initializer list should mention the members in the same order they are declared.

(简单)成员初始化列表应该按照成员被声明的次序处理它们。

原文链接

https://github.com/isocpp/CppCoreGuidelines/blob/master/CppCoreGuidelines.md#c47-define-and-initialize-member-variables-in-the-order-of-member-declaration

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