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const is a qualifer that, when applied, will make sure that const variables are read-only. Such attempt to modify a const variable directly will result in a compiler error.
Additionally, const variables mut be initialized upon declaration.
Another use of const is to make functions const. Const functions promises to NOT modify member variables of its' class. The const keyword is placed after the identifier, but before the function body.
const int c{5}; // uniform initilization
// now c is const, any attempt to modify it results in an error
c = 6; // error, c is const
int d;
d = c; // fine, we're not modifing c

// another example:

class A
{

int a;
public:

A(): a(5) {}

void incrementA() { ++a; }

void incrementA2() const { ++a; } // error, incrementA2 is const, and will not modify a
};
const by SomeGuyThatDoesn'tIncludeSex September 16, 2019

T* const this 

The hidden *this pointer that's present in every member function of a class (at least, in C++).
class Something
{

int a,b;
public:

Something(int a, int b): this->a(a), this->b(b)

{}

void doSomething() {} // is translated into "void doSomething(Something* const this) {}"

// The T in "T* const this" is replaced with the class type

friend void doSomething2() {} // is not translated, as it is NOT a member function
};
void doSomething2() {}

WEST COAST ELITIST 

A person of east coast decent who moved west and lost all sensibilities from the old country... Lives in multiple places in California, travels abroad multiple times a year, eats only the freshest, organic, non gmo, cage free, range free diet while sitting watching jets highlights from 1993
That bitch be trippin yo, his west coast elitist ass ain’t comin back to the motherland without an attitude adjustment..I’m gonna make dat ho pay for a slice at m&s and a coke... you got that right bra!!

coinstar lottery

The subsequent elation and unfettered spending garnered by the newfound wealth one acquired by dragging an overfilled change jar down to the local Coinstar machine.
After paying bills and buying gas, Drew was feeling broke until he won the Coinstar Lottery.

Bo was buying rounds of drinks like he won the Coinstar lottery.

Melissa's 'night in' changed to her 'night out' after she won the Coinstar lottery.

you must construct additional pylons 

This is possibly the most annoying phrase in the real-time-strategy game Starcraft.

The basic objective of Starcraft is to make a big army to destroy your opponent, however you have this army-size limit known as 'supply' that can only be increased by building a specific building, and for the alien faction 'protoss', that building is the pylon. So every 2-4 soldiers you build, you most build another pylon to sustain them. If you forget, a voice says "YOU MUST CONSTRUCT ADDITIONAL PYLONS", and at that point, you realise that you can't build any more guys until you send a worker to build the pylon, and then wait for the pylon to finish. Then, 4 soldiers later, you will have to build ANOTHER one.

What makes this phrase especially annoying is how often the guy says it if you forget to build them, because soldiers of the protoss race take up so much supply, and their pylons provide such little supply.
*tries to build a soldier*

"YOU MUST CONSTRUCT ADDITIONAL PYLONS"

Wadsworth Constant 

The Wadsworth Constant is the fundamental idea that the true meaning of a video, conversation, or comment approaches importance after approximately 30% of it has been skipped over.
The above definition, for instance, has 180 characters. After applying the Wadsworth Constant, we skip over 52 characters (29%). The definition now reads,
"the true meaning of a video, conversation, or comment approaches importance after approximately 30% of it has been skipped over."