CODEWITHSUNDEEP
c++
mayaa
mayaa

Reputation: 113

Initialize a list of lists in C++

I want to initialise a list of lists (as in Python) in C++. Suppose the list is: [['a','b'],['c','d']]

New to C++, and mostly worked in Python so not sure what to do. 

std::vector<vector<string>> dp {{'a',b'}};

I have tried this but doesn't seem to work.

no matching function for call to 'std::vector<std::vector<std::__cxx11::basic_string<char> > >::vector(<brace-enclosed initializer list>)'|

Upvotes: 0

Views: 2723

Answers (2)

Ted Lyngmo
Ted Lyngmo

Reputation: 118097

It looks similar in C++, but string literals should be surrounded by " not ' (which is for character literals).

#include <iostream>
#include <string>
#include <vector>

int main() {
    std::vector<std::vector<std::string>> dp{{"hello", "world"},
                                             {"goodbye", "for", "now"}};
    for(const auto& v : dp) {
        for(const std::string& s : v) {
            std::cout << s << " ";
        }
        std::cout << "\n";
    }
}

Output:

hello world
goodbye for now

Upvotes: 11

Frodyne
Frodyne

Reputation: 3983

Are you after something like this?

    std::vector<std::vector<std::string>> dp = {
        {"a", "b"},
        {"c", "d"},
        {"e","f"}
    };

Upvotes: 0

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