Re: Strength of sequence vs alternative parsers

http://en.cppreference.com/w/cpp/language/operator_precedence

So, yes...

  /Mikael

-----Original Message-----
From: Michael Powell [mailto:[email protected]] 
Sent: Wednesday, December 6, 2017 16:08
To: Spirit General Mailing List <[email protected]>
Subject: [Spirit-general] Strength of sequence vs alternative parsers

Hello,

Am I correct in observing that the Sequence parser (>>) is stronger than the alternative parser (|)?

i.e.

my_rule = a >> b >> c | d >> e >> f ;

So, in other words, parenthesis are unnecessary, per se?

my_rule = ( a >> b >> c ) | ( d >> e >> f ) ;

Unless those groupings require additional operators, like Optional (-), let's say.

my_rule = ( a >> b >> c ) | ( d >> -( e >> f ) ) ;

Thanks!

Cheers,

Michael Powell

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