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    ALP User Documentation 0.7.0
    
   Algebraic Programming User Documentation 
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Compares std::pair inputs taking the first entry in every pair as the comparison key, and returns true or false accordingly.  
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#include <ops.hpp>
Inherits Operator< internal::equal_first< D1, D1, D1, config::default_backend > >.
Compares std::pair inputs taking the first entry in every pair as the comparison key, and returns true or false accordingly. 
The input domains must both be std::pair.
The output domain must hence be castable from bool.