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Vector< vector<int> >::iterator temp = mincost.end(); vector<int> a = *temp; if ( *temp != *(temp--) ) return 0;
mincost is a 2d vector, I want to get the last vector<int> of this vector and last-- . I don't really understand about...
Started by nXqd on
, 4 posts
by 4 people.
Answer Snippets (Read the full thread at stackoverflow):
Since you want the last two elements, you should first test to be sure the vector actually ....
Luck!
minconst.end() points to the element one-past-the-end of the vector minconst ; it doesn't point to the last element in the vector.
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Given two vectors of integers, how to determinate if there's some element from 1st vector is present in 2nd one?
Answer Snippets (Read the full thread at stackoverflow):
You could take the set_intersection of both vectors, and then check if the resulting intersection is empty:
std::sort(v1.begin(), v1.end()); std::sort(v2.begin(), v2.end()); std::set_intersection(v1.begin() , v1.end() , v2.begin() , v2.end() , ....
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Hi!
I have some vectors of class A objects:
std::vector<A> *V1; std::vector<A> *V2;
etc
there is a function with a vector of pointers of A:
std::vector<A *> *arranged;
what I need to do is put the vectors from V1, V2 etc inside arranged...
Started by Jonathan on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
vector containing the composition of all members of the other vectors w/o actually copying the objects vector's life definitely exist such that none of its source-vectors will change? That is: you cannot just have raw pointers....
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Is there anything wrong with pushing back a vector of vectors? like
typedef vector<Point> Polygon; vector<Polygon> polys; polys.push_back(some_poly);
All the elements in some_poly will be copied right?
I have a bug in my code and I can't seem...
Started by Mark on
, 5 posts
by 5 people.
Answer Snippets (Read the full thread at stackoverflow):
There are performance implications if you're going to push a vector, the vector is copied like....
Std::vector will push just fine, so the bug must be elsewhere - obviously we'd need more details to help further.
The right thing etc).
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The question's pretty self-explanatory really. I know vaguely about vectors in maths, but I don't really see the link to C++ vectors. Thanks!
Started by Skilldrick on
, 12 posts
by 12 people.
Answer Snippets (Read the full thread at stackoverflow):
Also, computer scientists love thinking an excellent type for storing N dimensional ... .
I'd guess it comes from the term row vector .
This is pretty much in line the structure.
A vector is simply a sequence of values, all of the same type.
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All Points are Vectors, and all Vectors are Points. All Directions are Vectors, NOT all Vectors are Directions (this shouldn't mean both way conversion shouldn't be allowed). I want to have the operators overridden once for all preferably since they're...
Started by manixrock on
, 7 posts
by 7 people.
Answer Snippets (Read the full thread at stackoverflow):
In a base class with a protected constructor, and define Point and Vector as leaf subclasses of this base, I'd argue that a Vector and a Point are not the same, by algebra:
Point + Vector => Point (translation) Vector +....
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I want to be able to have a vector of vectors of some type such as:
vector<vector<MyStruct> > vecOfVec;
I then create a vector of MyStruct, and populate it.
vector<MyStruct> someStructs; // Populate it with data
Then finally add someStructs...
Started by Tim Rupe on
, 6 posts
by 6 people.
Answer Snippets (Read the full thread at stackoverflow):
In C++0x, you'll be able to use the vector's move(MyStruct()); or use smart pointers and have a vector of smart pointers to vector<MyStruct>
I know this can be accomplished by using....
The swap trick is as good as it gets with C++03 .
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Hi,
Consider these classes,
class Base { ... }; class Derived : public Base { ... };
this function
void BaseFoo( std::vector<Base*>vec ) { ... }
And finally my vector
std::vector<Derived*>derived;
I want to pass derived to function BaseFoo...
Started by andreas buykx on
, 9 posts
by 9 people.
Answer Snippets (Read the full thread at stackoverflow):
Also, you should pass the vector by const-reference, not by value;
Alternatively, change the vector....
You should also pass "heavy" objects like a vector by const; and insert Derived objects into it.
Updated it to use a const reference.
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Question:
What is the difference between:
vector<string> and vector<char *> ? How would I pass a value of data type: string to a function, that specifically accepts:
const char * ? For instance :
vector<string> args(argv, argv + argc...
Started by Aaron on
, 5 posts
by 5 people.
Answer Snippets (Read the full thread at stackoverflow):
If you store std::string's in a vector, or anywhere else, then everything.
And deallocation functionality.
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My model would best use some
v int[30][i][N_i];
structure that is 30 vectors of tuples of ints, where
v[0] is a dummy,
v[1] are plain ints (N_0 of them),
v[2] are pairs of int (N_1 pairs)
...
v[29] would be 29-tuples of int (N_29 of them)
This is not ...
Started by Michael on
, 4 posts
by 4 people.
Answer Snippets (Read the full thread at stackoverflow):
As I wrote....
The best way to wrap existing behavior is to write a new class that is implemented with your fancy vector of vector of what ever.
The best way to do what you want is write wrapper functions around the vector accessors.
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