Making only the outer vector in vector<vector<int>> fixed
Posted
by
Dennis Ritchie
on Stack Overflow
See other posts from Stack Overflow
or by Dennis Ritchie
Published on 2012-12-08T10:50:03Z
Indexed on
2012/12/08
11:05 UTC
Read the original article
Hit count: 500
c++
I want to create a vector<vector<int>> where the outer vector is fixed (always containing the same vectors), but the inner vectors can be changed. For example:
int n = 2; //decided at runtime
assert(n>0);
vector<vector<int>> outer(n); //outer vector contains n empty vectors
outer.push_back(vector<int>()); //modifying outer vector - this should be error
auto outer_it = outer.begin();
(*outer_it).push_back(3); //modifying inner vector. should work (which it does).
I tried doing simply const vector<vector<int>>, but that makes even the inner vectors const.
Is my only option to create my own custom FixedVectors class, or are there better ways out there to do this?
© Stack Overflow or respective owner
