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Generics in Go
Lesson 8
30 May 2024
Tags: golang, go
Pavel Tišnovský
Red Hat, Inc.
https://github.com/RedHatOfficial/GoCourse
@RedHat
* Sources
- [[https://github.com/RedHatOfficial/GoCourse]]
.image ./common/qr_address.png
* Gophers
#The Go gopher was designed by Renee French. (http://reneefrench.blogspot.com/)
#Source https://golang.org/doc/gopher/fiveyears.jpg
#The design and this image is licensed under the Creative Commons 3.0 Attributions license.
.image ./common/fiveyears.jpg _ 900
* Generics in Go
* Why generics?
- to be able to create something similar to Numpy in Go
- true abstract data types
- lists
- trees
- priority queues
- ...
* Non-generic functions
.play lesson8/01_print.go
* Overloaded function in Go?
.play lesson8/02_print_overload.go
* No automatic type conversions
.play lesson8/03_print_no_conversion.go
* Generics implemented in runtime
.play lesson8/04_print_interface.go
* Generic function
.play lesson8/05_generic_print.go
* Selection of generic function
.play lesson8/06_type_parameter.go
* Compilation type checks
.play lesson8/07_type_parameter_check.go
* Concrete comparable interface
.play lesson8/08_comparable.go
* Problem with overloading
.play lesson8/09_comparable_variable_types.go
* Generic comparable interface
.play lesson8/10_compare_type_parameters.go
* Compile time or runtime?
- Python
.code lesson8/Test.py
* Compile time or runtime?
- Python
.code lesson8/Test.py.asm
* Compile time or runtime?
- Java
.code lesson8/Test.java
* Compile time or runtime?
.code lesson8/Test.java.asm / public static void main/,/^}/
* Generic comparable interface (again)
.play lesson8/10_compare_type_parameters.go
* Compile time or runtime?
- go
- interface{} - runtime
- type parameters - compile time
$ go tool compile -S 08_comparable.go > 08_comparable.s
$ go tool compile -S 10_compare_type_parameters.go > 10_compare_type_parameters.s
* Compiled concrete function
"".compare STEXT nosplit size=7 args=0x10 locals=0x0 funcid=0x0 align=0x0
0x0000 00000 (08_comparable.go:7) TEXT "".compare(SB), NOSPLIT|ABIInternal, $0-16
0x0000 00000 (08_comparable.go:7) PCDATA $3, $1
0x0000 00000 (08_comparable.go:8) CMPQ BX, AX
0x0003 00003 (08_comparable.go:8) SETGT AL
0x0006 00006 (08_comparable.go:8) RET
* Compiled generic function
"".compare[go.shape.int_0] STEXT dupok nosplit size=7 args=0x18 locals=0x0 funcid=0x0 align=0x0
0x0000 00000 (10_compare_type_parameters.go:11) TEXT "".compare[go.shape.int_0](SB), DUPOK|NOSPLIT|ABIInternal, $0-24
0x0000 00000 (10_compare_type_parameters.go:11) PCDATA $3, $1
0x0000 00000 (10_compare_type_parameters.go:12) CMPQ CX, BX
0x0003 00003 (10_compare_type_parameters.go:12) SETGT AL
0x0006 00006 (10_compare_type_parameters.go:12) RET
"".compare[go.shape.float64_0] STEXT dupok nosplit size=8 args=0x18 locals=0x0 funcid=0x0 align=0x0
0x0000 00000 (10_compare_type_parameters.go:11) TEXT "".compare[go.shape.float64_0](SB), DUPOK|NOSPLIT|ABIInternal, $0-24
0x0000 00000 (10_compare_type_parameters.go:11) PCDATA $3, $1
0x0000 00000 (10_compare_type_parameters.go:12) UCOMISD X0, X1
0x0004 00004 (10_compare_type_parameters.go:12) SETHI AL
0x0007 00007 (10_compare_type_parameters.go:12) RET
"".compare[go.shape.string_0] STEXT dupok size=120 args=0x28 locals=0x28 funcid=0x0 align=0x0
0x0000 00000 (10_compare_type_parameters.go:11) TEXT "".compare[go.shape.string_0](SB), DUPOK|ABIInternal, $40-40
0x0000 00000 (10_compare_type_parameters.go:11) CMPQ SP, 16(R14)
0x0004 00004 (10_compare_type_parameters.go:11) PCDATA $0, $-2
0x0004 00004 (10_compare_type_parameters.go:11) JLS 63
...
...
0x002a 00042 (10_compare_type_parameters.go:12) PCDATA $1, $1
0x002a 00042 (10_compare_type_parameters.go:12) CALL runtime.cmpstring(SB)
...
...
0x003e 00062 (10_compare_type_parameters.go:12) RET
* "Universal numeric" data type?
.play lesson8/11_add_int.go
* "Universal numeric" data type?
.play lesson8/12_add_type_parameters.go
* No automatic type conversion (1/2)
.play lesson8/13_add_type_parameters.go /^package main/,/^func main/
* No automatic type conversion (2/2)
.play lesson8/13_add_type_parameters.go /^func main/,/^}/
* Type approximations (1/2)
.play lesson8/14_add_type_parameters.go /^package main/,/^func main/
* Type approximations (2/2)
.play lesson8/14_add_type_parameters.go /^func main/,/^}/
* Concrete "pow" function
.play lesson8/21_pow_floats_B.go
* Generic "pow" function
.play lesson8/22_pow_generic_B.go
* Generic method vs. generic function
.play lesson8/34_whats_better.go
* Generic linked list implementation
.play lesson8/35_list.go