C++核心準則C.47:按照成員變量聲明的次序定義和初始化數(shù)據(jù)成員

C.47:按照成員變量聲明的次序定義和初始化數(shù)據(jù)成員

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錯誤。這（聲明的次序，譯者注）是初始化執(zhí)行的順序（和成員初始化器的順序無關）

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.

(簡單)成員初始化列表應該按照成員被聲明的次序處理它們。

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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