Re: Linking error when changing > to >>

Besids the linking errors when switch from > to >> in this example, I am
getting a lot of linker errors, when I try to use boost::optional as a
member of an attribute

for example when I change 

auto const var_dec_def = x3::lexeme["var "] 
                         > +x3::alnum 
                         > ":" 
                         > type 
                         > ";"; 

to 

auto const var_dec_def = x3::lexeme["var "] 
                         > +x3::alnum 
                         > ":" 
                         > -type //type is now optional 
                         > ";"; 

and dont change something in the ast, it compiles fine, but when I change 

struct VariableDec { 
    std::string _name; 
    Type _type; 
}; 

to 

struct VariableDec { 
    std::string _name; 
    boost::optional<Type> _type; 
}; 

I am getting a linking error again.
Is this a bug or am I doing soemthing stupid?
If this is a totaly different topic, I will invest some time and create
another repo with a more minimal example to show my problem with this.

Greetings Exagon



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