I am trying to write a game in C++ with SDL, and I have a class that allows me to handle events. The class is actually really simple: It takes the SDL_Event, then 2 variables from 2 different enum to determine for which Event and which Key should be checked, and then a variable that will be modified if the event happens. Here is the class
As of yet the variable only changes if the Left key has been released, it will be extended if the error has been solved.
Then, in my main.cpp file I define the Event and the EventParser as
SDL_Event event;
EventParser<float> ep;
And in a loop, the parseEvent function is called like this:
ep.parseEvent(event, ep.KeyUp, ep.LEFT, &xVariable);
However I get a linker error (not the first one I got when programming this game)
error LNK2019: unresolved external symbol "public: void __thiscall EventParser<float>::parseEvent(union SDL_Event,enum EventParser<float>::EventType,enum EventParser<float>::KbdKey,float *)" (?parseEvent@?$EventParser@M@@QAEXTSDL_Event@@W4EventType@1@W4KbdKey@1@PAM@Z) referenced in function _SDL_mainC:UsersPrideRageDocumentsVisual Studio 2012ProjectsSDL_TestSDL_Testmain.objSDL_Template
I made this code (it does nothing I am just learning about classes, I was learning about friend functions) and I don't understand what is wrong, here is the code:
#include <iostream> #include <cstdlib> #include <cstring> using namespace std; class MyClass { public: friend int add(int a, int B)/>; [Code] ....
I know i didn't need to include cstdlib and cstring for this code but as I said, it's not supposed to be something it's just for practice and I was working on char arrays. My question is about the part where i try to define the function:
int MyClass::add(int a, int B)/> {}
My compiler(Microsoft Visual C++ 2010 Express) says that class MyClass has no member "add" even though it does...
I have been working a project in C++. I have TTTMain.cpp file that has all the function calls, TTTFuntions.cpp that has all the functions, I have TTT.h file that has all the prototypes and variables and additionally I have Winner.h that has enum class Winner declaration in it. Here is my block of codes:
Winner.h file:
#ifndef winner #define winner enum class Winner {
[Code]....
My question is when I compile this gives me error on
I am working on a program that uses a class I created called Student. I want to be able to add different students to a Binary Search Tree, and use the student's gpa (grade point average) to compare students with each other and place them in the correct location in the Tree.
I am a beginner with C++, taking a class right now. The lab this week is to create a user defined class and have it accesses in a separate .h header file from the main.
I think I'm finding my way through it, but I'm getting a complie error that makes no sense to me:
I'm trying to make a simple C++ program in which the user must try to guess a number, if they guess too high it says "too high" and if they guess too low it says "too low".
I also decided to add a feature which allows them to select how many tries they would like to guess the number. I tried to make "tries" type an enum so if the user could not pick an invalid number but for some reason i cannot use it in an if statement.
here is the code and i am getting the first error on line 27:
Code: #include <iostream> #include <ctime> #include <cstdlib> using namespace std; int guess;
I'm trying to convert the enum type {PG, R, G, PG-13, etc.} to strings so i can use it in cout statement but no matter what i put inside switch(), the compiler keeps saying Error: expression must have integral or enum type. What am I doing wrong exactly?
Movie covert_rating(Movie r) { switch (r) { case PG: return "PG"; break; case R: return "R";
Any way to use a string to access a specific item in a matrix of int[X].
I have a program which uses enums as iterators to reference a large amount of data. To select an item in the matrix, the user will enter a string, which is also an enum, which also must serve as an iterator for something in the matrix. Here is a toybox example:
The idea is the user executes the program by typing "./RUN First" to print out the first element in the MyNumbers array, "./RUN Second" to access the second, and so on. I can't use static numbers for the iterator. (i.e., "./RUN 1") I must reference by enum/string.
When run, the output of this problem is thus:
==================================================================== user@debian$ ./RUN Second Matrix[ atoi(Second) ]: 1 user@debian$ ====================================================================
As we know in C there is no checking if values passed to a function that takes enum are correct, that is if they have been defined in this enum. Example from Enums in C | Occasionally sane ([code] tags don't work on my fx 18.0.1 this is why I put in on pb): [URL] ......
Here c - How to check if an enum variable is valid? - Stack Overflow they say that common convention is add check whether value passed as the parameter is not bigger than the maximum value in enum. But how about situations when enum is composed of numbers from 1-20 and then from 500-510?
I want my program read the file and when encounter any enum type, instead of treating it as a string, I want the program store it in memory as a enum value.
How can I do that?
string s; ifs>>s; s // how to convert it to enum???
#include <iostream> #include <string> #include <vector> #include <map> const int ENUM_NOT_FOUND = -1; const std::string NEW = " "; enum Day {Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday};
[code]....
Ouput with GCC 4.8.1:
Monday Tuesday Wednesday Thursday Friday Saturday Sunday Name a day: Friday day = Friday
But the problem is that whenever I define a new enum, I have to define the << and >> overloads for the new enum again. Isn't there a way to template that as well, so that the << and >> overload needs to be defined just once? My atttempt:
fails to compile. I guess the problem is Enum is not known at compile time, even though it should be deducible during run time? Error mentions ambiguous overload for operator>>.
// Purpose: To write a program that displays the number of millimeters higher the current level the ocean level will be in // in 5, 7, and 10 years.
# include <iostream> # include <string> using namespace std; int main() { float X = 10; string Y="";
[Code] ....
But I get the following error message:
IntelliSense: expession must have integral or unscoped enum type
three times in a row for lines 25, 27, and 29 and I don't understand or know why?
In case the purpose does make sense here are the directions:
2.7: Ocean Levels
Assuming the ocean’s level is currently rising at about 1.5 millimeters per year, write a program that displays
•The number of millimeters higher than the current level that the ocean’s level will be in 5 years, •The number of millimeters higher than the current level that the ocean’s level will be in 7 years, •The number of millimeters higher than the current level that the ocean’s level will be in 10 years,
Output labels:
Each value should be on a line by itself, preceded by the a label of the form:
In X years the ocean's level will be higher by Y millimeters.
where X is the number of years (5, 7 or 10) and Y is the value you calculate.
