在C ++中使用结构 [英] Using structs in C++
问题描述
我有以下结构：
typedef struct
{
string symbol;
string同义词;
同义词（string _synonym，string _symbol）{
synonym = _synonym;
symbol = _symbol;
}
}同义词;
编译时，我收到以下警告：
：警告C4183：''同义词''：缺少返回类型;假设是一个成员
函数返回''int''
我可以不为结构使用构造函数吗？我以前见过很多次
..
这是不好的做法吗？
我应该担心这个吗警告？
此外，我想用值填充此表。我想
将它声明为类中的静态成员 - 类似于：
同义词sym [] = {
....
};
无论如何我都找不到这样做（即没有编译错误）
static同义词syms []
I have the following struct:
typedef struct
{
string symbol;
string synonym;
Synonym(string _synonym, string _symbol) {
synonym = _synonym;
symbol = _symbol;
}
} Synonym ;
When I compile, I get the following warning:
: warning C4183: ''Synonym'': missing return type; assumed to be a member
function returning ''int''
Can I not use constructors for structs?. I''ve seen this done many times
before ..
Is this bad practise ?
Should I worry about this warning ?
Further more, I want to populate this table with values. I want to
declare it as a static member in a class - something like:
Synonyms sym[] = {
....
};
I cant find anyway to do this (i.e. without compilation errors)
static Synonym syms[]
推荐答案
Bit Byte写道：
Bit Byte wrote:
我有以下结构：
typedef struct
{
string symbol;
string同义词;
同义词（string _synonym，string _symbol）{
synonym = _synonym;
symbol = _symbol;
}
}同义词;
I have the following struct:
typedef struct
{
string symbol;
string synonym;
Synonym(string _synonym, string _symbol) {
synonym = _synonym;
symbol = _symbol;
}
} Synonym ;
你被困在C ville。你的定义应该更像是：
struct同义词
{
...
} ;
You''re stuck in C ville. Your definition should look more like:
struct Synonym
{
...
};
Bit Byte写道：
Bit Byte wrote:
我有以下结构：
typedef struct
{
string symbol;
string synonym;
同义词（string _synonym，string _symbol）{
synonym = _synonym;
symbol = _symbol;
}
}同义词;
当我编译时，我收到以下警告：
：警告C4183：''同义词''：缺少返回类型;假设是一个成员
函数返回''int''
我可以不为结构使用构造函数吗？我已经看过很多次了
之前..
I have the following struct:
typedef struct
{
string symbol;
string synonym;
Synonym(string _synonym, string _symbol) {
synonym = _synonym;
symbol = _symbol;
}
} Synonym ;
When I compile, I get the following warning:
: warning C4183: ''Synonym'': missing return type; assumed to be a member
function returning ''int''
Can I not use constructors for structs?. I''ve seen this done many times
before ..
你可以，但是编译器怎么知道呢
同义词（string _synonym，string _symbol）
是构造函数：它与结构的名称不匹配，
这是匿名的。你的typedef只声明同义词是
未命名结构的别名。如果你想使用像类一样的结构，请使用一个
有一个名字：
struct同义词
{
string symbol;
string synonym;
同义词（string _synonym，string _symbol）{
synonym = _synonym;
symbol = _symbol;
}
};
BTW：您可能希望更喜欢初始化：
struct同义词
{
字符串符号;
字符串同义词;
同义词（string _synonym，string _symbol）
：symbol（_symbol）
，同义词（_synonym）
{}
};
You can, but how shall the compiler know that
Synonym(string _synonym, string _symbol)
is meant to be the constructor: it does not match the name of the struct,
which is anonymous. Your typedef just declares Synonym to be an alias for
the unnamed struct. If you want to use a struct like a class, use one that
has a name:
struct Synonym
{
string symbol;
string synonym;
Synonym(string _synonym, string _symbol) {
synonym = _synonym;
symbol = _symbol;
}
};
BTW: you may want to prefer initialization:
struct Synonym
{
string symbol;
string synonym;
Synonym(string _synonym, string _symbol)
: symbol ( _symbol )
, synonym ( _synonym )
{}
};
>
这是不好的做法？
>
Is this bad practise ?
编号遗留类型的设置是。
No. The legacy-typedef thing is.
我应该担心这个警告吗？
Should I worry about this warning ?
是。
Yes.
>
更多，我想用值填充此表。我想
将它声明为类中的静态成员 - 类似于：
同义词sym [] = {
....
};
无论如何我都找不到（即没有编译错误）
>
Further more, I want to populate this table with values. I want to
declare it as a static member in a class - something like:
Synonyms sym[] = {
....
};
I cant find anyway to do this (i.e. without compilation errors)
您的结构不是POD。我认为，
非POD类型没有数组初始化语法。
最佳
Kai-Uwe Bux
Your struct is not a POD. I think, there is no array-initializer syntax for
non-POD types.
Best
Kai-Uwe Bux
" Kai-Uwe Bux" < jk ******** @ gmx.netwrote in message
news：ea ********** @ murdoch.acc.Virginia.EDU ...
"Kai-Uwe Bux" <jk********@gmx.netwrote in message
news:ea**********@murdoch.acc.Virginia.EDU...
BTW：您可能希望更喜欢初始化：
struct同义词
{
字符串符号;
字符串同义词;
同义词（字符串_synonym，字符串_symbol）
：符号（_symbol）
，同义词（_同义词）
{}
};
BTW: you may want to prefer initialization:
struct Synonym
{
string symbol;
string synonym;
Synonym(string _synonym, string _symbol)
: symbol ( _symbol )
, synonym ( _synonym )
{}
};
>>
这是不好的做法吗？
>>
Is this bad practise ?
编号遗留类型的东西是。
No. The legacy-typedef thing is.
与变量名中的前导下划线一样。
As is the leading underscore in the variable names.
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