Question

i dont understand some things in a code from a tutorial
first one: what is that comma “,” doing in the middle there? is it mb a overloaded operator?

u32 TimeStamp = irrTimer->getTime(), DeltaTime = 0;

next i have a weird constructor from class CharacterDemo, why is there a “:” following some variables with weird brackets? im guesseing they are beeing initialized with the value in the brackets.. ?

CharacterDemo::CharacterDemo()
:
m_indexVertexArrays(0),
m_vertices(0),
m_cameraHeight(4.f),
m_minCameraDistance(3.f),
m_maxCameraDistance(10.f)
{
    m_character = 0;
    m_cameraPosition = btVector3(30,30,30);
}

im rly curiouse, explanation much appriciated

Answer 1

It’s an initialization list.

It calls the constructors of the members and parent classes of the specified class.

Note that you can only use it in the constructor of a class (because it only happens at its construction).

[edit] For your first question, it’s a way to declare multiple variables of the same type at once. Note that it will not always work as expected : int * a, b will declare a variable a of type int *, and another variable b of type int (not a pointer).