README
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Pointers
Pointers provide a way to share data across function boundaries. Having the ability to share and reference data with a pointer provides flexbility. It also helps our programs minimize the amount of memory they need and can add some extra performance.
Notes
- Use pointers to share data.
- Values in Go are always pass by value.
- "Value of", what's in the box. "Address of" ( & ), where is the box.
- The (*) operator declares a pointer variable and the "Value that the pointer points to".
1.5 Garbage Collection
Links
Pointer Mechanics
https://golang.org/doc/effective_go.html#pointers_vs_values
http://www.goinggo.net/2013/07/understanding-pointers-and-memory.html
http://www.goinggo.net/2014/12/using-pointers-in-go.html
Stacks
Escape Analysis and Inlining
https://github.com/golang/go/wiki/CompilerOptimizations
Garbage Collection
https://en.wikipedia.org/wiki/Tracing_garbage_collection
https://blog.golang.org/go15gc
Single Static Assignment Optimizations
GopherCon 2015: Ben Johnson - Static Code Analysis Using SSA
https://github.com/golang/go/blob/dev.ssa/src/cmd/compile/internal/ssa/compile.go#L83
https://godoc.org/golang.org/x/tools/go/ssa
Code Review
Sharing data I (Go Playground)
Sharing data II (Go Playground)
Exercises
Exercise 1
Part A Declare and initialize a variable of type int with the value of 20. Display the address of and value of the variable.
Part B Declare and initialize a pointer variable of type int that points to the last variable you just created. Display the address of , value of and the value that the pointer points to.
Template (Go Playground) | Answer (Go Playground)
Exercise 2
Declare a struct type and create a value of this type. Declare a function that can change the value of some field in this struct type. Display the value before and after the call to your function.
Template (Go Playground) | Answer (Go Playground)
All material is licensed under the Apache License Version 2.0, January 2004.
Directories
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| Path | Synopsis |
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Sample program to show the basic concept of pass by value.
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Sample program to show the basic concept of pass by value. |
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Sample program to show the basic concept of using a pointer to share data.
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Sample program to show the basic concept of using a pointer to share data. |
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Sample program to show the basic concept of using a pointer to share data.
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Sample program to show the basic concept of using a pointer to share data. |
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Sample program to show variables stay on or escape from the stack.
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Sample program to show variables stay on or escape from the stack. |
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exercises
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exercise1
Declare and initialize a variable of type int with the value of 20.
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Declare and initialize a variable of type int with the value of 20. |
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exercise2
Declare a struct type and create a value of this type.
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Declare a struct type and create a value of this type. |
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template1
Declare and initialize a variable of type int with the value of 20.
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Declare and initialize a variable of type int with the value of 20. |
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template2
Declare a struct type and create a value of this type.
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Declare a struct type and create a value of this type. |