C++ Cheatsheet(inc. C++2011) Cheat Sheet by Leupi Leupi via via cheatography.com/5907/cs/1197/
Standard Sytemtypes and their range
Nullpointer
Basic Operators
int8_t
-128 to 127
int* pInt;
+
addition
u i n t8 _ t
0 t o 25 5
-
subtraction
*
multiplication
//old, deprecated: if(pInt == NULL)
int16_t
-32768 to 32767
u i n t1 6 _ t
0 t o 65 5 35
if(pInt == nullptr)
/
division
in t3 t32_ t
-2 14 1474 83 836 48 48 t o 21 21 47 4748 36 364 7
//still valid:
%
m o du l o
++va ++v ar
increase before
uint32 _t _t
0 t o 42 94 9496 72 729 5
int64_t
-9.2 * 1018 to 9.2 * 1018
u i n t6 4 _ t
0 to 1.8 * 1019
Literals & Co. 255
I n te g e r
0xaf
Hexadecimal Integer
1234.0
double
234. 243f
float
true
b oo l
"Hello World"
string/c-string
'a'
char
Preprocessor #include
Includes standard header file
//new:
if(!pInt)
evaluation Bitwise Operators var++ Bitwise AND
|
Bitwise OR
condition ? result :
short form of if-like
^
Bitwise XOR
alternative;
structure
~
Bitwise NOT
::
Scope Operator
<<
Shift left
->
pointer-to-member
>>
Shift right
.
Access member
<< >>
Bitshift(with streams:
Test of equality
!=
Test of non-equality
<
Less than
>
Greater than Less than or equal
content) or defines a variable to be a pointer
Pointers: Quick and dirty
LIB
#include
Includes Header.h file
>=
Greater than or equal
!
NOT
&&
AND
||
OR
Defines Easy Macro
3.14159265359 #define f(a,b)
More Complex Macro
a+b
input/output)
==
#define PI
evaluation
Boolean Logic
<=
"Header.h"
increase after
&
&
Gets RA RAM ad adress of of Va Variable(to sa save into pointer)
*
->
Dereferences pointer(returns it´s
Access p oi ointe r class memb er er. sa same as (*pointer).member()
new ne w
Crea Cr eate te ne new w ob obje ject ct on he heap ap,, ret retur urns ns pointer to object
Boolean expressions in C++ are evaluated leftto-right!
delete dele te
Remove Rem ove obj object ect at the poin pointer ter on heap
#undef PI PI
Remove De Definition
Pointers allocate space on heap, normal
#ifdef PI PI
Checks fo for de definition, ifif tr true,
variables on stack!
code will be compiled #else
Else part of the above ifstatement
#end i f
Ends the if-statement
By Leupi
Published 18th August, 2013.
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Last updated 18th August, 2013.
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C++ Cheatsheet(inc. C++2011) Cheat Sheet by Leupi via cheatography.com/5907/cs/1197/
using replaces typedef
Range based loops
//typedef is deprecated
//Easy range based loop:
typedef uint32_t uint32;
std::vector vec = .....;
//now: using directive!
for(int i : vec) //foreach i in vec
//using identifier = type_name;
//Same with auto:
using uint32 = uint32_t;
const auto vi = ....; for(auto i : vi)
Auto Datatype
Works with all Containers with begin() and
//auto is an automatic datatype:
end()
int x = 4; //equals: auto y = 4; //works for most cases, esp. STL: for(std::vector::Iterator it = v.begin().....) //with auto: for(auto it = v.begin; it != v.end(); ++it)
