How to initialize a vector of vectors on a struct

Question

If I have a NxN matrix  vector lt  vector lt int gt   gt  A    How should I initialize it   I ve tried with no success    A   new vector dimension     neither    A   new vector dimension vector lt int gt  dimension

User · Answer

Like this    include  lt vector gt           std  vector lt std  vector lt int gt  gt  A dimension  std  vector lt int gt  dimension       Pre-C  11 you need to leave whitespace between the angled brackets

User · Answer

You use new to perform dynamic allocation  It returns a pointer that points to the dynamically allocated object   You have no reason to use new  since A is an automatic variable  You can simply initialise A using its constructor   vector lt vector lt int gt   gt  A dimension  vector lt int gt  dimension

[c++] How to initialize a vector of vectors on a struct?

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