Re: [Boost-users] still stuck on expectation points

On Fri, Apr 16, 2010 at 6:34 PM, philip tucker wrote:

This

start %= (constitkind > id > ':' > id >> probs) % ","; // FAILS

Should read

start %= (constitkind >> id > ':' > id >> probs) % ","; // FAILS

Sorry.

Because of how operator precedence works in C++. You should pretty well memorize the C++ precedence rules before starting to use more advanced C++ features that rely on fancy operator usage, else run into a lot of 'fun' things like this. Basically this: start %= (constitkind >> id > ':' > id >> probs) % ","; Is read as this to the C++ parser: start %= (constitkind >> (id > ':' > id) >> probs) % ","; Because greater-then's have a different precedence level then right-shifts.