• Mike Wynn (57/57) Mar 06 2003 just taken me an hour to track this one down;

"Mike Wynn" <mike.wynn l8night.co.uk> writes:

just taken me an hour to track this one down;
(yes I know close will get called twice on strm, the real code can handle
that)

for some reason having a byte[] inside the templated class causes the
program to crash on exit
(even initialising it to null or new byte[1]; does not help )

as far as I can tell (initially I thought that the abstract close() was
getting called hence its commented out)
there is nothing programatically wrong with this code.


import c.stdio;

class InputStream
{
public:
 this() { }
 ~this() { printf("~this((\n"); close(); printf("))\n");}
 void   close() { printf("OOPS\n"); }
// abstract void close();
}

class FileInputStream : InputStream
{
public:
 this( wchar[] name ) {
 }

 void close() {
  printf( "+close FileIS\n" );
 }
}

template Filters( IStreamT : InputStream ) {
 class FilteredInputStream : InputStream {
  protected IStreamT stream;
  this( IStreamT strm ) { stream = strm; }
  void close() { printf("fis {\n"); stream.close(); printf("foo}"); }
 }
 class BufferedInputStream : FilteredInputStream {
  byte[] buffer; // remove this and it works
  this( IStreamT strm, int buflen ) {
   super( strm );
//   buffer = null;
  }
  this( IStreamT strm ) {
   this( strm, 4096 );
  }
 }
}

alias instance Filters(FileInputStream).BufferedInputStream buffer;

int main( char[][] argv )
{
 try {
  FileInputStream strm = new FileInputStream("foo");
  buffer b = new buffer( strm );
 } catch (Exception e) {
  printf( "Exception %.*s", e.msg );
 } finally {
  printf( "Done0.\n" );
 }
 return 0;
}