1.4: Simplest Good Use Of eval

• Dynamic loading of a module via its class name
• require can take a bareword class name to load

  	require Template::Simple ;
  
  

• or it can take a expression with a proper module file including the .pm suffix
  • To make require work from a class name you need to convert :: to / (or the proper local directory separator)
  • You need to append .pm
  • Could be done with a sub or module.

  	$module = 'Template/Simple.pm' ;
  	require $module ;
  
  

• This trivial and clean to do with eval STRING

  	eval "require $module" ;
  
  

• You can trap the error of the module not being found!
  • You could do that with eval BLOCK and the require expression example but with more code