C++ Cheatsheet(inc. C++2011) Cheat Sheet

A Programming › C cheat sheet in English by Leupi

Cpp Programming Intermediate Advanced C C-0x

104,073 views 24,362 downloads 18 Aug 2013 History

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Standard Sytemtypes and their range

int8_t	-128 to 127
uint8_t	0 to 255
int16_t	-32768 to 32767
uint16_t	0 to 65535
int32_t	-2147483648 to 2147483647
uint32_t	0 to 4294967295
int64_t	-9.2 * 10¹⁸ to 9.2 * 10¹⁸
uint64_t	0 to 1.8 * 10¹⁹

Literals & Co.

255	Integer
0xaf	Hexadecimal Integer
1234.0	double
234.243f	float
true	bool
"Hello World"	string/c-string
'a'	char

Preprocessor

#include <LIB>	Includes standard header file LIB
#include "Header.h"	Includes Header.h file
#define PI 3.14159265359	Defines Easy Macro
#define f(a,b) a+b	More Complex Macro
#undef PI	Remove Definition
#ifdef PI	Checks for definition, if true, code will be compiled
#else	Else part of the above if-statement
#endif	Ends the if-statement

Nullpointer

int* pInt;
//old, deprecated:
if(pInt == NULL)
//new:
if(pInt == nullptr)
//still valid:
if(!pInt)

Bitwise Operators

&	Bitwise AND
\|	Bitwise OR
^	Bitwise XOR
~	Bitwise NOT
<<	Shift left
>>	Shift right

Boolean Logic

==	Test of equality
!=	Test of non-equality
<	Less than
>	Greater than
<=	Less than or equal
>=	Greater than or equal
!	NOT
&&	AND
\|\|	OR

Boolean expressions in C++ are evaluated left-to-right!

Basic Operators

+	addition
-	subtraction
*	multiplication
/	division
%	modulo
++var	increase before evaluation
var++	increase after evaluation
condition ? result : alternative;	short form of if-like structure
::	Scope Operator
->	pointer-to-member
.	Access member
<< >>	Bitshift(with streams: input/output)

Pointers: Quick and dirty

&	Gets RAM adress of Variable(to save into pointer)
*	Dereferences pointer(returns it´s content) or defines a variable to be a pointer
->	Access pointer class member. same as (*pointer).member()
new	Create new object on heap, returns pointer to object
delete	Remove object at the pointer on heap

Pointers allocate space on heap, normal variables on stack!

using replaces typedef

//typedef is deprecated

typedef uint32_t uint32;

//now: using directive!
//using identifier = type_name;

using uint32 = uint32_t;

Auto Datatype

//auto is an automatic datatype:
int x = 4; //equals:
auto y = 4;

//works for most cases, esp. STL:
for(std::vector<int>::Iterator it = v.begin().....)
//with auto:
for(auto it = v.begin; it != v.end(); ++it)

Compile-time assertion check

static assert(bool_constexpr, string)

Multithreading

//Thread Creation & Management:
void thread_func(int a)
{
std::cout << "My Number is: " << a;
}
main()
{
std::thread t1(thread_func(1));
t1.join();
}
//Synchronization via:
std::mutex.lock();
std::mutex.unlock();

Range based loops

//Easy range based loop:
std::vector<int> vec = .....;
for(int i : vec) //foreach i in vec

//Same with auto:
const auto vi = ....;
for(auto i : vi)

Works with all Containers with begin() and end()

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Comments (1)

John Doe VI 13:28 24 Feb 2016

Very basic and straightforward. Would have preferred to have the comments placed to the right instead of above and readjust other parts to the second page to accommodate proper spacing. Thanks.