C++核心準(zhǔn)則C.45:使用類內(nèi)初始化器初始化數(shù)據(jù)成員

C.45: Don't define a default constructor that ?only initializes data members; use in-class member initializers instead

C.45:不要只初始化數(shù)據(jù)成員的默認(rèn)構(gòu)造函數(shù)；使用類內(nèi)成員初始化器

Reason（原因）

Using in-class member initializers lets the compiler generate the function for you. The compiler-generated function can be more efficient.

使用類內(nèi)初始化器可以讓編譯器為你生成一個(gè)函數(shù)。編譯器生成的函數(shù)效率更高。

Example, bad（反面示例）

class X1 { // BAD: doesn't use member initializers
 ? ?string s;
 ? ?int i;
public:
 ? ?X1() :s{"default"}, i{1} { }
 ? ?// ...
};

Example（示例）

class X2 {
 ? ?string s = "default";
 ? ?int i = 1;
public:
 ? ?// use compiler-generated default constructor
 ? ?// ...
};

Enforcement(實(shí)施建議)

(Simple) A default constructor should do more than just initialize member variables with constants.

(簡(jiǎn)單)默認(rèn)構(gòu)造函數(shù)應(yīng)該比使用常量初始化數(shù)據(jù)成員做的更多。

譯者注：差不多就是殺雞焉用牛刀的意思。

原文鏈接

https://github.com/isocpp/CppCoreGuidelines/blob/master/CppCoreGuidelines.md#c45-dont-define-a-default-constructor-that-only-initializes-data-members-use-in-class-member-initializers-instead

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