length is a PolymorphicFunctionObject for fetching the length of sub_match.  
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#include <regex_actions.hpp>
Classes | |
| struct | result | 
| struct | result< This(Sub)> | 
Public Member Functions | |
| template<typename Sub > | |
| Sub::difference_type | operator() (Sub const &sub) const | 
length is a PolymorphicFunctionObject for fetching the length of sub_match. 
      
  | 
  inline | 
| sub | The sub_match object.  | 
sub.length()