A UIColor is not mutable. I usually do this with colors, fonts and images. You could easily modify it to use singletons or have a static initializer. @interface UIColor (MyProject) +(UIColor *) colorForSomePurpose; @end @implementation UIColor (MyProject) +(UIColor *) colorForSomePurpose { return [UIColor colorWithRed:0.6 green:0.8 blue:1.0 alpha:1.0]; } @end
Yes, it can be a constant. You should declare your HashMap instance as follows: class <class name> { private static final HashMap<Integer, String> tensNumberConversion = new HashMap<>(); static { tensNumberConversion.put(2, “twenty”); tensNumberConversion.put(3, “thirty”); tensNumberConversion.put(4, “forty”); tensNumberConversion.put(5, “fifty”); tensNumberConversion.put(6, “sixty”); tensNumberConversion.put(7, “seventy”); tensNumberConversion.put(8, “eighty”); tensNumberConversion.put(9, “ninety”); } } However, this is only a constant reference. While … Read more
There is a huge difference between the two ways. const bool isReady() The code above will return a const bool, but it does not guarantee that the object will not change its logic state. bool isReady() const This will return a bool, and it guarantees that the logic state of your object will not change. … Read more
First, it’s just an implementation detail, and if you put const there, don’t put it in the declaration set (header). Only put it in the implementation file: // header void MyFunction(int age, House &purchased_house); // .cpp file void MyFunction(const int age, House &purchased_house); { … } Whether or not a parameter is const in a … Read more
I would think that you should only put them at the class level if they are used by multiple methods. If it is only used in that method then that looks fine to me.
The most important thing is consistency. If there aren’t any coding guidelines for this, then pick one and stick with it. But, if your team already has a de facto standard, don’t change it! That said, I think by far the more common is const int * i; int * const j; because most people … Read more
If you want to set a value, use the set method. get Methods are only to obtain variables, not to set the inner variables of a class (If they are defined the way you did). The correct usage is: Customer* CreateCustomer(const string& id, const string& name, const string& address) { Customer* temp = new Customer(); … Read more
Consider this code, #define WIDTH 300 enum econst { eWidth=300 }; const int Width=300; struct sample{}; int main() { sample s; int x = eWidth * s; //error 1 int y = WIDTH * s; //error 2 int z = Width * s; //error 3 return 0; } Obviously each multiplication results in compilation-error, but … Read more
If you are using Spring, you have this enum org.springframework.web.bind.annotation.RequestMethod public enum RequestMethod { GET, HEAD, POST, PUT, PATCH, DELETE, OPTIONS, TRACE; } EDIT : Here is the complete list of constants values in Java 6 You can see that some of those are available in the class HttpMethod but it contains less values than … Read more
Put your constants into their own module: # constants.py RED = 1 BLUE = 2 GREEN = 3 Then import that module and use the constants: import constants print “RED is”, constants.RED The constants can be any value you like, I’ve shown integers here, but lists and dicts would work just the same.