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herbsutter.com

Website review herbsutter.com

 Generated on April 21 2021 09:39 AM

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The score is 61/100

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Sutter’s Mill – Herb Sutter on software development



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Herb Sutter on software development



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Property Content
type website
title Sutter’s Mill
description Herb Sutter on software development
url https://herbsutter.com/
site_name Sutter’s Mill
image https://secure.gravatar.com/blavatar/4554b8d24c7f200dc5e2e1b18db1893f?s=200&ts=1618990786
image:width 200
image:height 200
locale en_US
Headings
H1 H2 H3 H4 H5 H6
27 53 13 0 0 0
  • [H1] Sutter’s Mill
  • [H1] GotW #101 Solution: Preconditions, Part 2 (Difficulty: 7/10)
  • [H1] Notes
  • [H1] Acknowledgments
  • [H1] GotW #101: Preconditions, Part 2 (Difficulty: 7/10)
  • [H1] Notes
  • [H1] GotW #100 Solution: Preconditions, Part 1 (Difficulty: 8/10)
  • [H1] Notes
  • [H1] Acknowledgments
  • [H1] Trip report: Winter 2021 ISO C++ standards meeting (virtual)
  • [H1] GotW #100: Preconditions, Part 1 (Difficulty: 8/10)
  • [H1] Notes
  • [H1] GotW #99 Solution: Postconditions (Difficulty: 7/10)
  • [H1] Notes
  • [H1] Acknowledgments
  • [H1] GotW #99: Postconditions (Difficulty: 7/10)
  • [H1] Notes
  • [H1] GotW #98 Solution: Assertion levels (Difficulty: 5/10)
  • [H1] Notes
  • [H1] Acknowledgments
  • [H1] GotW #98: Assertion levels (Difficulty: 5/10)
  • [H1] GotW #97 Solution: Assertions (Difficulty: 4/10)
  • [H1] Notes
  • [H1] Acknowledgments
  • [H1] Follow by email
  • [H1] Tweets
  • [H1] Archives
  • [H2] 1. Consider these functions, expanded from an article by Andrzej Krzemieński: [1] … How many ways could a caller of each function get the arguments wrong, but that would silently compile without error? Name as many different ways as you can.
  • [H2] (a) is_in_values (int val, int min, int max)
  • [H2] (b) is_in_container (int val, int idx_min, int idx_max)
  • [H2] (c) is_in_range (T val, Iter first, Iter last)
  • [H2] 2. Show how can you improve the function declarations in Question 1 by …
  • [H2] (a) just grouping parameters, using a struct with public variables
  • [H2] (b) just using an encapsulated class, using a class with private variables (an abstraction with its own invariant)
  • [H2] (c) just using post-C++20 contract preconditions (not yet valid C++, but something like the syntax in [2])
  • [H2] 3. Consider these three examples, where each shows expressing a boolean condition either as a function precondition or as an encapsulated invariant inside a new type… In each of these cases, which way is better? Explain your answer.
  • [H2] JG Question
  • [H2] Guru Questions
  • [H2] 1. What is a precondition, and how is it related to an assertion?
  • [H2] Explain your answer using the following example, which uses a variation of a proposed post-C++20 syntax for preconditions. [1]
  • [H2] 2. Rewrite the example in Question 1 to show how to approximate the same effect using assertions in today’s C++.
  • [H2] Are there any drawbacks to your solution compared to having language support for preconditions?
  • [H2] 3. If a precondition fails, what does that indicate, and who is responsible for fixing the failure?
  • [H2] Explain how this makes a precondition fundamentally different from every other kind of contract.
  • [H2] 4. Consider this example, expanded from a suggestion by Gábor Horváth:
  • [H2] a) What kinds of preconditions must a caller of calc satisfy that can’t generally be written as testable boolean expressions?
  • [H2] b) What kinds of boolean-testable preconditions are implicit within the explicitly written declaration of calc?
  • [H2] c) Should any of these boolean-testable implicit preconditions also be written explicitly here in this precondition code? Explain.
  • [H2] Our virtual 2021
  • [H2] Today: A few more C++23 features adopted
  • [H2] What’s next
  • [H2] JG Question
  • [H2] Guru Questions
  • [H2] 1. What is a postcondition, and how is it related to an assertion?
  • [H2] Explain your answer using the following example, which uses a variation of a proposed post-C++20 syntax for postconditions. [1]
  • [H2] 2. Rewrite the example in Question 1 to show how to approximate the same effect using assertions in today’s C++. Are there any drawbacks to your solution compared to having language support for postconditions?
  • [H2] 3. Should a postcondition be expected to be true if the function throws an exception back to the caller?
  • [H2] Justify your answer with example(s).
  • [H2] 4. Should postconditions be able to refer to both the initial (on entry) and final (on exit) value of a parameter, if those could be different?
  • [H2] If so, give an example.
  • [H2] JG Question
  • [H2] Guru Questions
  • [H2] 1. Give one example each of an asserted condition whose run-time evaluation is:
  • [H2] a) super cheap
  • [H2] b) arbitrarily expensive
  • [H2] 2. What does the answer to Question 1 imply for assertion checking? Explain.
  • [H2] 3. Give an example of an asserted condition that is in general impossible to evaluate, and so cannot be checked.
  • [H2] Can these kinds of conditions still be useful?
  • [H2] 4. How do these questions help answer:
  • [H2] a) what “levels” of asserted conditions we should be able to express?
  • [H2] b) why the assertions we can “practically” write are a subset of all the ones we might “ideally” like to write?
  • [H2] JG Questions
  • [H2] Guru Questions
  • [H2] 1. What is an assertion, and what is it used for?
  • [H2] 2. C++20 supports two main assertion facilities… For each one, briefly summarize how it works, when it is evaluated, and whether it is possible for the programmer to specify a message to be displayed if the assertion fails.
  • [H2] 3. If an assertion fails, what does that indicate, and who is responsible for fixing the failure?
  • [H2] 4. Are assertions primarily about checking at compile time, at test time, or at run time? Explain.
  • [H2] Posts navigation
  • [H2]
  • [H2]
  • [H3] (a) A vector that is sorted
  • [H3] // (b) A vector that is not empty
  • [H3] (c) A pointer that is not null
  • [H3] (1) Type invariants
  • [H3] (2) Subexpression preconditions
  • [H3] (3) Subexpressions that make the whole precondition false
  • [H3] Putting it all together
  • [H3] Option 1 (basic): Named return object + an exit guard
  • [H3] Option 2 (better): “return post” postcondition pattern
  • [H3] Option 3 (mo’betta): Wrapping up option 2… with a macro
  • [H3] assert
  • [H3] static_assert
  • [H3] Bonus: [[assert: ?
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Text/HTML Ratio Ratio : 16%

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In-page links We found a total of 197 links including 2 link(s) to files



Anchor Type Juice
Skip to content Internal Passing Juice
Sutter’s Mill Internal Passing Juice
GotW #101 Solution: Preconditions, Part 2 (Difficulty: 7/10) Internal Passing Juice
GotW #98 Internal Passing Juice
“Contracts, preconditions and invariants” External Passing Juice
“P0542: Support for contract based programming in C++” External Passing Juice
P0515 External Passing Juice
P0893 External Passing Juice
“I.12 Declare a pointer that must not be null as not_null” External Passing Juice
Herb Sutter Internal Passing Juice
C++ Internal Passing Juice
GotW Internal Passing Juice
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9 Comments Internal Passing Juice
GotW #101: Preconditions, Part 2 (Difficulty: 7/10) Internal Passing Juice
GotW #100 Solution: Preconditions, Part 1 (Difficulty: 8/10) Internal Passing Juice
#97 Internal Passing Juice
#99 Internal Passing Juice
Trip report: Winter 2021 ISO C++ standards meeting (virtual) Internal Passing Juice
priorities External Passing Juice
schedule External Passing Juice
P1102 External Passing Juice
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2 Comments Internal Passing Juice
GotW #100: Preconditions, Part 1 (Difficulty: 8/10) Internal Passing Juice
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“P0052: Generic Scope Guard and RAII Wrapper for the Standard Library” External Passing Juice
“Change the Way You Write Exception-Safe Code – Forever” External Passing Juice
compose External Passing Juice
11 Comments Internal Passing Juice
GotW #99: Postconditions (Difficulty: 7/10) Internal Passing Juice
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assumes what we want to prove External Passing Juice
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“Planning and Coding of problems for an Electronic Computing Instrument” External Passing Juice
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“P0542: Support for contract based programming in C++” External Passing Juice
spdlog: Fast C++ logging library External Passing Juice
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SEO Keywords
Keywords Cloud because int abstraction all preconditions auto precondition wrong using type
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int 32
wrong 29
type 29
using 24
preconditions 24

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