How to check if bool method returns value in an if statement C++ - c++

Question

I'm having a go at creating classes and have created this method inside
Input.cpp:
bool Input::CheckKeyPress(char key)
{
SDL_Event ev;
while (SDL_PollEvent(&ev))
{
keyState = SDL_GetKeyboardState(NULL);
if (ev.type == SDL_KEYDOWN)
{
switch (key)
{
case 'w' :
if (keyState[SDL_SCANCODE_W])
{
return 1;
}
else
{
return 0;
}
case 'a' :
if (keyState[SDL_SCANCODE_A])
{
return 1;
}
else
{
return 0;
}
case 's' :
if (keyState[SDL_SCANCODE_S])
{
return 1;
}
else
{
return 0;
}
case 'd' :
if (keyState[SDL_SCANCODE_D])
{
return 1;
}
else
{
return 0;
}
}
}
}
}
I try to use it in an if-statement in my main class like so:
if (bool Input::CheckKeyPress(w))
{
//do stuff
}
However as expected I get an error saying: "A function type is not allowed here" So what do I do?

Answer 1

Just write:
if (CheckKeyPress(w))
{
//do stuff
}
You have already told the compiler that the CheckKeyPress() method returns a bool. Here, you are just calling the function, so you don't need to mention the return type again. When the control will call the function CheckKeyPress(), it will return a bool value that would be checked for its truth within the if statement.
Note: There are two possibilities:
Instance is a different class:
If Instance is altogether a different class and CheckKeyPress() is
one of the methods that it contains, then you first need to create an object of the Instance class like below:
Instance it = new Instance(); //or just Instance it;
and then access the function via:
it.CheckKeyPress();
If the method is static:
In this case you need to call the method as:
Input::CheckKeyPress(w)
without just the return type (bool).
Hope this is helpful. Thank you for your inputs, #user4581301.