Jason Turner - Object Lifetime Puzzlers Book 1
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This book is for sale at http://leanpub.com/objectlifetimepuzzlers_book1
This version was published on 2021-12-15
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Welcome to the land of objects. In this land, objects say their first name when their lifetime begins, and say their last name when their lifetime ends.
We have four different types of object lifetimes that we will eventually encounter.
- automatic
- static
- thread_local
- dynamic
Each type of lifetime has its own rules for when the lifetime begins and lifetime ends, and well explain them as we get to them!
Every object in our land looks like this:
Sobject_1("First Name","Last Name");S: The objects Typeobject_1: The objects ID"First Name": The objects first name"Last Name": The objects last name
Important note:
Anything starting with // is a comment and has no impact on the code!
Some puzzles split across pages. Sometimes this is annoying. Ive decided to leave it how it is because it adds a sense of realism to what its actually like to read unnecessarily complex C++ code.
Each of these examples are real C++ code. If you are a C++ user, you can learn more about object lifetime with these puzzles.
These puzzles come directly from classes that I teach with C++ programmers. If you find them interesting, contact me about training. https://articles.emptycrate.com/training.html
Each solution is a topic that has something to do with C++. If you cannot figure out what the solution means, then duckduckgo for it and learn something new :).
If you arent a C++ user then dont worry about any of this, just have fun!
Automatic lifetime is the default. Objects with automatic lifetime have their lifetime begin
when their ID is first seen, and their lifetime end when their ID is no longer visible (after the ending }).
voidrun(){Sobject_1("1","2");}When this code is run, this is what happens:
voidrun(){Sobject_1("1","2");// 1 is printed}// 2 is printed, object_1 is no longer visibleThe output is:
12Objects lifetimes end in the reverse order they begin:
voidrun(){Sobject_1("1","2");Sobject_2("3","4");}When this code is run, this is what happens:
voidrun(){Sobject_1("1","2");// 1 is printedSobject_2("3","4");// 3 is printed}// 4 is printed, object_2's lifetime ends first// 2 is printed, object_1's lifetime ends secondThe output is:
1342We can introduce a new scope with a {. Now remember, an automatic objects lifetime
ends when its ID is no longer visible. When it goes out of scope.
voidrun(){{Sobject_1("1","2");}Sobject_2("3","4");}When this code is run, this is what happens:
voidrun(){{Sobject_1("1","2");// 1}// 2Sobject_2("3","4");// 3}// 4The output is:
1234voidrun(){Sobject_1("p","s");Sobject_2("l","u");}Answer(4):________voidrun(){{Sobject_1("s","l");{Sobject_2("t","r");}Sobject_3("t","o");}}Answer(6):____________voidrun(){{{Sobject_1("p","a");}Sobject_2("c","k");}Sobject_3("a","d");Sobject_4("g","e");}Answer(8):________________voidrun(){{Sobject_1("w","e");}{SFont size:
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