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Invalid declarator before with map of struct?


Invalid declarator before with map of struct?

By : Arktikh
Date : November 22 2020, 02:59 PM
To fix this issue Syntax issues aside, your code smells Java. In C++ where functions are first-class citizens, you do not need to create callback classess for every possible callback. Instead, you simply pass function-like objects - either a pointer to function, or something wrapped inside std::function. The former is simpler, the latter is more powerful. I suggest to work with simple pointers first. For instance, your code might be looking like following:
code :
void do_cmd(const std::vector<std::string>& args);
typedef void (*cmd_func)(const std::vector<std::string>& cmd_args);
std::map<std::string, cmd_func> cmd_map = { {"cmd", &do_cmd} };

int main() {
   (*cmd_map["cmd"])(args);
}


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error: invalid declarator before ‘&’ token

error: invalid declarator before ‘&’ token


By : user2908710
Date : March 29 2020, 07:55 AM
I hope this helps you . Missing ; after the class definition.
Why the weird error message? Because it's entirely legal to create an object at that level of scope:
code :
class ABC {
...
} globalABC;
error: invalid declarator before with typedef

error: invalid declarator before with typedef


By : Arbi
Date : March 29 2020, 07:55 AM
To fix this issue You haven't shown us which source line the error refers to, but I'll assume it's this one:
code :
typedef Callback<void, Ptr<Vehicle>, std::string, Ptr<const Packet> > DeviceTraceCallback; 
invalid declarator before ‘MY_MAP’

invalid declarator before ‘MY_MAP’


By : Oscar
Date : March 29 2020, 07:55 AM
To fix this issue Your Link class definition should end with a semicolon after the last curly bracket.
C++ compiler error: “invalid declarator before”

C++ compiler error: “invalid declarator before”


By : user3488027
Date : March 29 2020, 07:55 AM
Does that help There are several things wrong with your code.
The line the compiler complains about is the definition of the static geometry method of FactGeometry. The structure of a definition is:
code :
<Return Type> <Class>::<Method Name>(<Parameters>) { ... }
std::shared_ptr<FactGeometry> FactGeometry::geometry(int choice){
    // code
}
table.push_back(FactGeometry::make_shared<FactGeometry>geometry(choice));
return make_shared<CalcRectangle>();
return shared_ptr<FactGeometry>(new CalcRectangle());
Invalid Initializer Member Declarator

Invalid Initializer Member Declarator


By : asdf
Date : March 29 2020, 07:55 AM
Hope this helps I am trying to check if a field returned from SQL is null or not but I keep getting "Invalid Initializer Member Declarator" on the isDBNull , Make sure all properties are initialized within {} e.g.
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