where to declare function object class

[zs0723]

I want to write my own function objects and used in vector<T>
instanstance,
for example

class equalDate
{
string m_date;
public:
equalDate(string date):m_date(date){}

bool operator()(string date)
{
return date == m_date;
}
};


used in another class A's foo() function:
void A::foo()
{

remove_if(vDate.begin(),vDate.end(),qualDate(baseDate));
}

my question is where to declare class "equalDate ", put it in class
A scope
or a separate file ?

 

[programmer]

If you just use the class "equalDate" in class A, you can just
declare it in the class A's header file. Otherwise, you need to
declare it in a separate file.

 

[Eric Pruneau]

I want to write my own function objects and used in vector<T>
instanstance,
for example

class equalDate
{
string m_date;
public:
equalDate(string date):m_date(date){}

bool operator()(string date)
{
return date == m_date;
}
};

the class equalDate is useless in your case. The stl already has the
template equal_to functor.
and since string has an operator == you can just type

remove_if(vDate.begin(),vDate.end(), bind2nd(equal_to<string>(), baseDate));
// #include <functionnal> needed here

by the way if you want to erase the elements equal to baseDate, you have to
call erase with the returned iterator of remove_if.

vector<string> NewEnd = remove_if(...);
erase(NewEnd, vDate.end());


Eric