CODEWITHSUNDEEP
c++
David
David

Reputation: 2190

Read non constant c string into string class

I need to read a non-constant C string into a C++ string. However, I only see methods in the string class that read constant C strings into the string class.

Is there anyway to do this in C++?

Update:

#include <iostream>

using namespace std;

int main(int argc, char** argv)
{
    string a;

    // other code here

    a(argv[0]);

    cout << a << endl;
    return 0;
}

error:

test.cpp: In function 'int main(int, char**)':
test.cpp:11:14: error: no match for call to '(std::string {aka std::basic_string<char>}) (char*&)'
     a(argv[0]);

I did some more investigation, and replaced argv[0] with a constant string, and found that I still got a similar error message. A better question would now be: How can I declare an object and call its constructor later?

Upvotes: 0

Views: 101

Answers (1)

Ed Swangren
Ed Swangren

Reputation: 124722

You're misinterpreting what the function signatures mean. The conversion takes its argument as a const char *, but that doesn't mean that you cannot pass a char* to it. It's just telling you that the function will not modify its input. Why don't you just try it out?

#include <iostream>
#include <string>

int main() 
{
    char str[] = "hello";
    std::string cppstr = str;
    std::cout << cppstr << endl;
    return 0;
}

Upvotes: 4

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