Hi I have a problem where at compile time, I don't know how many vectors in my program are needed. The number required depends on a data set given at run-time, which will results in the range of vectors needed to be from 1 to N.
So if the data set requires ten vectors, it will create vec1,vec2,......vecN
How can i dynamically create the vectors so that they all have a different name?
I would then need to call each array separately. Presumably I could just use strings and a few loops for this.
You can't do that directly. However, you could use a map to store a vector name, and the vector itself:
map<string, vector<int> > myMap;
You can add elements simply like this (if the element with such key doesn't exist yet):
vector<int> vec;
myMap["vec"] = vec;
If you'll do it with a key that already exists, the value will be replaced. For example:
vector<int> vec;
vector<int> vec1;
myMap["vec"] = vec;
myMap["vec"] = vec1;//now myMap["vec"] holds the vec1 vector
You can also easlly access elements like this:
myMap["vec"]//this will access the vector with the key "vec1"
unordered_map to waste less resources.
You can create a vector to contain your vectors:
std::vector<std::vector<int>> my_vector_of_vectors;
// Add a vector
my_vector_of_vectors.push_back(std::vector<int>{});
// Add a number to the inner vector
my_vector_of_vectors[0].push_back(1);
you have a vector of vectors, vec[0] to vec[n], each one containing the vector.
However, this works est if you know the number of vectors (eg 10). If you need to add new ones on-demand, then a list of vectors or a map might be a better option for you.
