On macOS Sierra & OS to start/stop/restart MySQL post 5.7 from the command line:
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sudo launchctl load -F /Library/LaunchDaemons/com.oracle.oss.mysql.mysqld.plist sudo launchctl unload -F /Library/LaunchDaemons/com.oracle.oss.mysql.mysqld.plist mysqladmin ping systemctl status mysql.service mysqladmin -p -u root version |
P=Pointers, R=References
What is stored
P&R: Memory address
Can be re-assigned (to another address)
P: Yes
R: No
Can be null
P: Yes (use nullptr)
R: No (must be initialized)
Accessing contents
P: *ActorPtr
R: ActorRef
Accessing address
P: ActorPtr
R: &ActorRef
Changing the address
P: ActorPtr = &Actor
R: Not allowed
Changing the value
P: *ActorPtr = Actor
P: ActorRef = Actor
CopyOfActor = *ActorPtr;
ActorAddress = &Actor;
Symbol: * (dereference)
Syntax: *ActorPtr
Meaning: Contents at ActorPtr
Symbol: &
Syntax: &Actor, &ActorRef
Meaning: Address of Actor or ActroRef
Golden Rule: Use references unless you can’t.
– References are newer and safer.
– Pointers are older and provide back-compatibility.
– Pointers are more powerful but also dangerous.
close files: CTRL + F4
comment: CTRL + K, CTRL + C
uncomment: CTRL + K, CTRL + U
https://blogs.msdn.microsoft.com/zainnab/2010/04/13/comment-and-uncomment-code/
https://jeremybytes.blogspot.jp/2015/12/visual-studio-shortcuts-comment.html
ReSharper
https://www.jetbrains.com/resharper/
Types of IL (Intermediate Language)
– CIL (Common Intermediate Language)
– MSIL (Microsoft Intermediate Language)
View IL in Unity project on MonoDevelop
1. Open Edit References
Solution Window | References | Settings
2. Open dll file by Assembly Browser
Edit References | .Net Assembly | Browse
2 .NET Compilers
1) Intermediate Language Compiler => CIL (Common Intermediate Language)
2) JIT (just-in-time) Compiler => Machine Language (optimized for CPU)
int i = 456;
i = i + 1;
ldc.i4.1
ldloc.0
add
stloc.0
ldc.i4.1
Load the 4-byte signed integer constant 1 on the evaluation stack.
[Local variable locations] 456
[Evaluation stack] 1
ldloc.0
Load the variable in location 0 on the evaluation stack. The other value (1) on the stack is pushed down.
[Local variable locations] 456
[Evaluation stack] 456, 1
add
Add the top two numbers on the evaluation stack together, and replace them with the result.
[Local variable locations] 456
[Evaluation stack] 457
stloc.0
Remove the value at the top of the evaluation stack, and store it in location 0.
[Local variable locations] 457
[Evaluation stack]
box: box the top value on the stack
bne: branch if top 2 values on stack are not equal
call: call a static member of a class
callvirt: call an instance member of a class
ldelem/stelem: load and store array elements
newarr: create a new 1-dimensional array
newobj: create a new object on the heap
ret: return from method
throw: throw an exception
unbox: unbox the top reference on the stack
pop: Pop value from the stack.
dup: Duplicate the value on the top of the stack.
stsfld: Replace the value of field with val.
ldsfld: Push the value of field on the stack.
List of CIL instructions
https://en.wikipedia.org/wiki/List_of_CIL_instructions
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Huffpost Pollster
http://elections.huffingtonpost.com/pollster
Requests: HTTP for Humans
http://docs.python-requests.org/en/latest/
StringIO and cStringIO – Work with text buffers using file-like API
https://pymotw.com/2/StringIO/
