SaltyCode SaltyCode - 1 month ago 10
C++ Question

error: could not convert from 'std::string* {aka std::basic_string<char>*}' to 'std::string {aka std::basic_string<char>}'|

I'm trying to make a function that writes a file but i'm having issues passing a string as a parameter.

void writeFile(string filename, string letters, int size)
{
ofstream outputfile("output.txt");
outputfile << letters;
outputfile.close();

}

int main()
{
string letters[] = {"u", "l", "s", "n","m", "z", "a", "p", "b"};

int size = 9;

string filename = "Inputfile.txt";

writeFile(inputfilename.c_str(),letters,size);

}


And having this error.

error: could not convert from 'std::string* {aka std::basic_string<char>*}' to 'std::string {aka std::basic_string<char>}'|

Answer

An array of string items is passed as actual argument, where the formal argument is a single string.

You could replace the array with a single string.

Or with a set, or whatever suits the purpose, but then you'll have to change the called function accordingly.


The error mentions std::string* instead of an array, like std::string[9], because the array expression decays to an expression denoting a pointer to the first item, which it does because the array is not being bound to a reference or passed to sizeof or anything where the expression's array nature would have to be preserved.