pb_ds debug patch ?

[François Dumont]

Hi

     While working on libstdc++ I experiment a regression in usage of 
pb_ds priority_queue. To find out what was wrong I made some 
modifications in debug mode of this type to have the 
binary_heap_::assert_valid method report the file:line where the 
assert_valid is invoked and not always a line in the method 
implementation code. As most of methods are using a assert_valid after 
enter and an other before exit it helps me detect exactly after what 
code the data structure got corrupted.

     Here is the patch. Now that I found my regression should I revert 
those modifications or are you interested in me generalizing this 
approach to other priority_queue data structure policies and submit a 
final patch ? If so tell me if new macro names are ok with you ?

Regards

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