Vectors of structs

Hi, just a quick question about vectos of structs here. If I have this struct:

Code:

typedef struct _MyStruct
{

int Var1;
int Var2;

} MyStruct;

and I have this vector:

Code:

vector<MyStruct> MyVectorOfStructs;

and we'll say I did this:

Code:

MyStruct TempStruct;

for ( int i=0; i<10; i++ ) // Just assigning values to the vector.
{
 TempStruct.Var1=i;
 TempStruct.Var2=i;

 MyVectorOfStructs.push_back( TempStruct );
}

If I want to get MyVectorOfStructs fourth position Var1 (if you get me, it should be 5 or something), would I have to assign the fourth position of MyVectorOfStructs to a struct, and retrive the Var1 value from that, or is there a way I can directly retrive the value of the fourth position's Var1?

Thanks.

EDIT: I just wrote that down, didn't compile anything, so if there are errors, assume they're due to that.

Well vectors have an overloaded subscript operator so

Code:

MyVectorOfStructs[3].var1

should work. And there really is no reason to typedef a struct in C++. Another option is to use an iterator, but in this case, I'd say that's pointless

Code:

vector<MyStruct>::iterator vecIter = MyVectorOfStructs.begin() + 3;

vecIter->Var1;

I can't believe I didn't try that. I feel like a complete idiot now!

Sorry for waisting the space of the forum!

I think the typedef thing is just habbit. Is there anything wrong with it in C++?

Originally Posted by twomers

I think the typedef thing is just habbit. Is there anything wrong with it in C++?

there's nothing especially wrong with it, it's just unnecessary. (you don't write "signed int" every time you declare an int, do you? )

OTOH, if the struct is in a header shared between C and C++ sources, then it's actually a good thing.

>> OTOH, if the struct is in a header shared between C and C++ sources, then it's actually a good thing.

Good point. Meh, it's ... 7 letters, no biggie.

There's also 'at':

Code:

MyVectorOfStructs.at(3).Var1;

(STL == options++) == true;

> I think the typedef thing is just habbit. Is there anything wrong with it in C++?
It's automatic in C++

So all you needed was

Code:

struct MyStruct
{
int Var1;
int Var2;
};