 
            
            
            
            
                23 Mar
                
                    2021
                
            
            
                23 Mar
                
                '21
                
            
            
            
        
    
                9:24 p.m.
            
        Boost.Phoenix works as-is, probably by special-casing the stream manipulators: https://godbolt.org/z/5z6vc3bT9
https://github.com/boostorg/phoenix/blob/master/include/boost/phoenix/operat... Which incidentally leads to amusing results with std::wcout: https://godbolt.org/z/oT35sTM1r :-)