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| XorpReasonedException (const char* init_what, const char* file, 
			  size_t line, const string& init_why) | XorpReasonedException | 
Constructor for a given type for exception, file name, file line number, and a reason.
Parameters:
| init_what | the type of exception. | 
| file | the file name where the exception was thrown. | 
| line | the line in file where the exception was thrown. | 
| init_why | the reason for the exception that was thrown. | 
| const string  why () | why | 
[const]
Get the reason for throwing an exception.
Returns: the string with the reason for throwing an exception.
Reimplemented from XorpException.
| string _why | _why | 
[protected]