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:按照成员变量声明的次序定义和初始化数据成员
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）
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(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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