C Use vector rvalue as an argument-CodePudding

Consider the code snippet below:

void PrintLines(vector<string>& lines){}

vector<string> lines = {"Images", "Transcriptions"};
PrintLines(lines);

Is there a possibility to pass the lines values directly, without initializing the "lines" variable?

Like this:

PrintLines({"Images", "Transcriptions"});

CodePudding user response：

First things first, you've not specified the return type of the function when defining it.

Is there a possibility to pass the lines values directly, without initializing the "lines" variable?

Yes, you can do that by making the parameter lines to be a const lvalue reference to std::vector so that it can bind to rvalue as shown below:

//              vvvvv                                      added low level const here
void PrintLines(const std::vector<std::string>& lines)
^^^^                                                    // added void as return type here                                               
{

    for(const std::string&elem: lines)
    {
        std::cout<<elem<<std::endl;
    }
}



int main()
{
    PrintLines({"Images", "Transcriptions"});//calls PrintLines
    return 0;
}

Demo