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c++eclipse
user2946986
user2946986

Reputation: 63

Eclipse, C++ method str() could not be resolved

Using the default str() example from: http://www.cplusplus.com/reference/sstream/stringstream/str/

// stringstream::str
#include <string>       // std::string
#include <iostream>     // std::cout
#include <sstream>      // std::stringstream, std::stringbuf

int main () {
  std::stringstream ss;
  ss.str ("Example string");
  std::string s = ss.str();
  std::cout << s << '\n';
  return 0;
}

The code helper is saying str() could not be resolved, when building there is no errors related to str()

I have CDT GCC Built-in Compiler Settings on in Eclipse

And unchecked use global provider with the flags:

"${COMMAND} ${FLAGS} -E -P -v -dD -std=c++11 "${INPUTS}"

I also tried changing toolchains back and forth but no luck.

Upvotes: 1

Views: 1599

Answers (1)

A. Terstegge
A. Terstegge

Reputation: 201

The problem is somehow caused by the structure of the g++ header files. In header <sstream> there are only the 'basic' template classes defined. I had the same error with a ostringstream when calling the str() method. When I changed the variable type in my code to std::basic_ostringstream<char>, the error went away. Also autocompletion worked again (it didn't work before, which is a good sign that the eclipse scanner is somehow having problems). Of course this is not a real good solution, because it uses the basic_* type, but it is one to get rid of the (harmless) error. The typedefs for the 'official' types like ostringstream are forward-declared in the header <iosfwd>. When I include a typedef (in the global namespace) in my code after the standard include files:

typedef std::basic_ostringstream<char> ostringstream;

and use this type ostringstream instead of std::ostringstream, the error also goes away. So the problem is caused by the forward declarations in the standard header file <iosfwd> (which does not mean that these headers a wrong, simply the eclipse scanner is puzzeled by this).

I am using g++ (Ubuntu 5.4.0-6ubuntu1~16.04.5) 5.4.0 20160609 btw.

Upvotes: 1

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