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# I can't add item to ( std::vector < std::vector <std::string> > )

GUIMish
1#
GUIMish Published in 2017-12-07 11:53:14Z
 This question already has an answer here: add an element to an empty vector in c++: why push.back works and [] not 1 answer Loading data into a vector of structures 2 answers Why can't I add an item to vector : std::vector < std::vector > my_list; my_list[0][0] = "this is text"; std::cout << "text: " << my_list[0][0] << std::endl;  What am I doing wrong?
Bathsheba
2#
Bathsheba Reply to 2017-12-07 11:56:12Z
 Unlike some containers (such as std::map), a std::vector does not grow on demand. So before you index an element you need to make sure the std::vector has the appropriate size. You can do that by passing a size on construction. In your case you could use the flashy syntax std::vector < std::vector > my_list{{"this is a test"}};  to get things going.
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