结构和矢量 [英] structures and vector
问题描述
考虑这个结构：
typedef struct ServiceRecord
{
vector< string>服务;
vector< Date>日期;
} ServiceRecord;
日期在别处声明为：
typedef struct Date
{
int month;
int day;
int year;
}日期;
这个声明在课堂上：
ServiceRecord serviceRecord;
我该怎么办？将值推到其中一个向量上？
像2005年10月10日那样是日期向量的第一个日期。
serviceRecord.date.push_back（？ ??）
谢谢
Considering this struct:
typedef struct ServiceRecord
{
vector<string> service;
vector<Date> date;
} ServiceRecord;
Date is declared elsewhere as:
typedef struct Date
{
int month;
int day;
int year;
} Date;
And this declaration in a class:
ServiceRecord serviceRecord;
How would I go about pushing values onto one of the vectors?
like 10/10/2005 as the first date on the date vector.
serviceRecord.date.push_back( ??? )
Thanks
推荐答案
re *********** @ gmail.com 写道：
考虑这个结构：
typedef struct ServiceRecord
{
vector< string>服务;
向量<日期>日期;
} ServiceRecord;
别这么做。请
struct ServiceRecord
{
vector< string>服务;
vector< Date>日期;
};
日期在别处声明为：
typedef struct Date
{
int month;
int day;
int year;
}日期;
除非你需要与C兼容，否则也不要这样做。
这个声明在课堂上：
ServiceRecord serviceRecord ;
我如何将值推到其中一个向量上？
像2005年10月10日那样是日期向量的第一个日期。
serviceRecord .date.push_back（???）
Considering this struct:
typedef struct ServiceRecord
{
vector<string> service;
vector<Date> date;
} ServiceRecord;
Don''t do that. Do
struct ServiceRecord
{
vector<string> service;
vector<Date> date;
};
Date is declared elsewhere as:
typedef struct Date
{
int month;
int day;
int year;
} Date;
Unless you need to be compatible with C, don''t do that either.
And this declaration in a class:
ServiceRecord serviceRecord;
How would I go about pushing values onto one of the vectors?
like 10/10/2005 as the first date on the date vector.
serviceRecord.date.push_back( ??? )
日期d = {10,10,2005};
serviceRecord.date.push_back（ d）;
由于''Date''struct没有[参数化]构造函数，你不能
写一个表达式" 10 /2005分之10"或三个数字，
并将其转换为''Date'的实例。你可以编写一个
会这样做的函数：
日期createDate（int a，int b，int c} {
日期d = {a，b，c};
返回d;
}
但它可能会更好在''Date'中定义一个或两个构造函数'
struct。
V
Date d = { 10, 10, 2005 };
serviceRecord.date.push_back(d);
Since ''Date'' struct doesn''t have a [parameterized] constructor, you cannot
write a single expression that would take "10/10/2005" or three numbers,
and convert it into an instance of ''Date''. You can write a function that
would do that:
Date createDate(int a, int b, int c} {
Date d = { a, b, c };
return d;
}
but it would probably be better to define a constructor or two in ''Date''
struct.
V
> re***********@gmail.com < re ***********@gmail.com>写道：
> re***********@gmail.com <re***********@gmail.com> wrote:
考虑这个结构：
typedef struct ServiceRecord
{
vector< string> service;
vector< Date> date;
} ServiceRecord;
在C ++中，你不需要使用typedef对于结构。将其更改为：
struct ServiceRecord
{
vector< string> service;
vector< Date> date;
};
日期在别处声明为：
typedef struct Date
{
int month;
int day;
int year;
}日期;
有关typedef的评论，请参见上文。另外，考虑为Date添加一个
构造函数：
struct Date
{
int year ;
int month;
int int;
日期（int year_，int month_，int day_）
：年（年_）
，月（月_）
，日（day_）
{}
};
这个类中的声明：
ServiceRecord serviceRecord;
如何将值推送到其中一个向量上？
喜欢10/10/2005作为日期向量的第一个日期。
serviceRecord.date.push_back（???）
Considering this struct:
typedef struct ServiceRecord
{
vector<string> service;
vector<Date> date;
} ServiceRecord;
In C++, you do not need to use a typedef for structs. Change it to:
struct ServiceRecord
{
vector<string> service;
vector<Date> date;
};
Date is declared elsewhere as:
typedef struct Date
{
int month;
int day;
int year;
} Date;
See above for comment about typedef. Also, consider adding a
constructor for Date:
struct Date
{
int year;
int month;
int day;
Date(int year_, int month_, int day_)
: year(year_)
, month(month_)
, day(day_)
{ }
};
And this declaration in a class:
ServiceRecord serviceRecord;
How would I go about pushing values onto one of the vectors?
like 10/10/2005 as the first date on the date vector.
serviceRecord.date.push_back( ??? )
如果你像我上面那样定义构造函数，你应该可以这样做：
serviceRecord.date.push_back（Date（2005,10,10））;
-
Marcus Kwok
If you define a constructor as I did above, you should be able to do:
serviceRecord.date.push_back(Date(2005, 10, 10));
--
Marcus Kwok
谢谢大家！这有帮助。只是不记得怎么做。
Thanks guys! That helped. Just couldn''t remember how to do it.
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