CODEWITHSUNDEEP
c++c++11vectorinitializationstd-pair
hitchdiddy
hitchdiddy

Reputation: 129

How to initialize a vector of pair of string,string in a c++ class?

How do I initialize a vector of a pair of strings in a C++ class? I tried several things but none worked out.

vector<pair<string,string>> myVec(); //doesn't work

Upvotes: 7

Views: 13555

Answers (3)

Vlad from Moscow
Vlad from Moscow

Reputation: 310940

There is no need to initialize a vector such a way

vector<pair<string,string>> myVec();

It is a function declaration with name myVec that does not have parameters and has return type vector<pair<string,string>>

It is enough to write simply

vector<pair<string,string>> myVec;

because in any case you are creating an empty vector.

Or if you want that the vector had some initial values and your compiler supports C++ 2011 then you can also write for example

std::vector<std::pair<std::string, std::string>> myVec =
{
    { "first", "first" }, { "second", "second" }, { "third", "third" }
};

Upvotes: 13

Rahul Tripathi
Rahul Tripathi

Reputation: 172398

Try to use it like this, presently your function myVec has no parameters and return vector<pair<string,string>>:

vector<pair<string,string>> myVec{};

or

vector<pair<string,string>> myVec;

Upvotes: 3

Cory Kramer
Cory Kramer

Reputation: 117856

If you use () you run into the most vexing parse. You declared a function myVec that takes no arguments, and returns a vector<pair<string, string>>

Switch to {}

vector<pair<string,string>> myVec{};

Upvotes: 9

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