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# Testing return value optimization | |
# Reading materials if you don't know what it is: | |
# https://blog.knatten.org/2011/08/26/dont-be-afraid-of-returning-by-value-know-the-return-value-optimization/ | |
# https://stackoverflow.com/questions/12953127/what-are-copy-elision-and-return-value-optimization | |
# https://youtu.be/HNYOx-Vh_VA (Yes, I know this isn't "reading material") | |
struct DemoStruct(CollectionElement, Stringable): | |
var member1: Int | |
fn __init__(inout self, member1: Int): | |
self.member1 = member1 | |
print("Called constructor for " + str(self)) | |
fn __copyinit__(inout self, other: Self): | |
self.member1 = other.member1 | |
print("Called copy constructor for " + str(self)) | |
fn __moveinit__(inout self, owned other: Self): | |
self.member1 = other.member1 | |
print("Called move constructor for " + str(self)) | |
fn __del__(owned self): | |
print("Calling destructor for " + str(self)) | |
fn __str__(self) -> String: | |
return "DemoStruct(" + str(self.member1) + ")" | |
fn add_10(param: DemoStruct) -> DemoStruct: | |
print("Entering add_10 function") | |
var return_value = DemoStruct(param.member1 + 10) | |
print("Exiting add_10 function") | |
return return_value | |
fn main(): | |
var demo_obj_1 = DemoStruct(42) | |
var demo_obj_2 = add_10( | |
demo_obj_1 | |
) # The move constructor for DemoStruct was called here | |
print("After calling add_10 function") | |
print(demo_obj_1) | |
print(demo_obj_2) |
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