C++ Syntax (Toggle Plain Text)

normalXPrecedence["x"]   =  1;
normalXPrecedence["x^2"]      =  2;
normalXPrecedence["x^3"]         =  3;
normalXPrecedence["x^4"]      =  4;
normalXPrecedence["x^5"]      =  5;
normalXPrecedence["x^6"]     =  6;

normalXPrecedence["x"] = 1; normalXPrecedence["x^2"] = 2; normalXPrecedence["x^3"] = 3; normalXPrecedence["x^4"] = 4; normalXPrecedence["x^5"] = 5; normalXPrecedence["x^6"] = 6;

Are these lines actually in the global scope, or are you summarizing by removing the function that they reside in? Only declarations and definitions are allowed in the global scope, and assignment to an existing object isn't either. This works:

C++ Syntax (Toggle Plain Text)

#include <map>
 
std::map<int, int> m;
 
int main()
{
  m[10] = 1;
}

#include <map> std::map<int, int> m; int main() { m[10] = 1; }

This doesn't:

C++ Syntax (Toggle Plain Text)

#include <map>
 
std::map<int, int> m;
 
m[10] = 1;
 
int main()
{
}

#include <map> std::map<int, int> m; m[10] = 1; int main() { }

I see, that would make sense I guess...*scratch* Now Im going to have to find some way to initialize them I guess. *sigh* Function calls....unecessary function calls....ugly.

>Now Im going to have to find some way to initialize them I guess.
You can initialize an array of pairs, and then use one of the std::map constructors with the array to initialize normalXPrecedence:

C++ Syntax (Toggle Plain Text)

#include <iostream>
#include <string>
#include <map>
#include <utility>
 
template <typename T, int N>
char (&array(T(&)[N]))[N];
 
std::pair<std::string, int> init[] = {
  std::pair<std::string, int> ( "x", 1 ),
  std::pair<std::string, int> ( "x^2", 2 ),
  std::pair<std::string, int> ( "x^3", 3 ),
  std::pair<std::string, int> ( "x^4", 4 ),
  std::pair<std::string, int> ( "x^5", 5 ),
  std::pair<std::string, int> ( "x^6", 6 )
};
 
std::map<std::string, int> normalXPrecedence ( init, init + sizeof array ( init ) );
 
int main()
{
  std::map<std::string, int>::iterator it = normalXPrecedence.begin();
 
  while ( it != normalXPrecedence.end() ) {
    std::cout<< it->first <<" -- "<< it->second <<'\n';
    ++it;
  }
}

#include <iostream> #include <string> #include <map> #include <utility> template <typename T, int N> char (&array(T(&)[N]))[N]; std::pair<std::string, int> init[] = { std::pair<std::string, int> ( "x", 1 ), std::pair<std::string, int> ( "x^2", 2 ), std::pair<std::string, int> ( "x^3", 3 ), std::pair<std::string, int> ( "x^4", 4 ), std::pair<std::string, int> ( "x^5", 5 ), std::pair<std::string, int> ( "x^6", 6 ) }; std::map<std::string, int> normalXPrecedence ( init, init + sizeof array ( init ) ); int main() { std::map<std::string, int>::iterator it = normalXPrecedence.begin(); while ( it != normalXPrecedence.end() ) { std::cout<< it->first <<" -- "<< it->second <<'\n'; ++it; } }

That saves you the effort of using a function or hardcoded loop to populate the map.