Re: non-const reference to temporary

From:
"Chris Morley" <chris.morley@lineone.net>
Newsgroups:
comp.lang.c++.moderated
Date:
Sat, 16 Aug 2008 21:24:09 CST
Message-ID:
<48a6864c$0$2925$fa0fcedb@news.zen.co.uk>

WriteEverythingToFile(File("AFileName.txt"), std::string("This stuff
goes into the file"));

g++ will tell me this is an error because I'm passing a non const
reference to a temporary (anonymous variable with no name).


No I wouldn't have though it was an error either. What is your File
constructor like?

Does this compile & run?

Chris

---- 8< -------- 8< -------- 8< -------- 8< -------- 8< -------- 8< ----

#include <string>
#include "stdio.h"
#include "conio.h"

class File {
public:
  // File( const char* fn ) : filename(fn) {} //ok too
  File( const std::string& fn ) : filename(fn) {}
  ~File() { display(); }

  void write( const std::string& stuff ) { buf += stuff; }

  void display();

private:
  std::string filename;
  std::string buf;
};

void File::display()
{
  printf( "Filename: %s\n", filename.c_str() );
  printf( "Contents:\n%s\n", buf.c_str() );
  printf( "Display end...\n\n" );
}

void WriteEverythingToFile( File& file, const std::string& text)
{
  file.write(text);
}

int main(int argc, char* argv[])
{
  WriteEverythingToFile(File("AFileName.txt"), std::string("This stuff goes
into the file"));
  File("afilename").write("this is some text");

  _getch();
  return 0;
}

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