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herbsutter.com

Webbplats analys herbsutter.com

 Genereras på April 21 2021 09:39 AM

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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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Egendom Innehåll
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
Rubriker
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: ?
Bilder Vi hittade 5 bilder på denna webbsida.

5 alt attribut är tomma eller saknas. Lägg till alternativ text så att sökmotorer enklare kan förstå innehållet i dina bilder.
Text/HTML Ratio Ratio : 16%

Bra, den här sidans förhållande mellan text till HTML-kod är högre än 15, men lägre än 25 procent.
Flash Perfekt, inga Flash-innehåll har upptäckts på denna sida.
Iframe Bra, vi upptäckte inga Iframes på den här sidan.

URL Rewrite Bra. Dina adressfält ser bra ut!
Understreck i URLen Perfekt! Inga understreck upptäcktes i din webbadress.
In-page länkar Vi hittade totalt 197 länkar inklusive 2 länk(ar) till filer



Anchor Typ Juice
Skip to content Interna Passing Juice
Sutter’s Mill Interna Passing Juice
GotW #101 Solution: Preconditions, Part 2 (Difficulty: 7/10) Interna Passing Juice
GotW #98 Interna Passing Juice
“Contracts, preconditions and invariants” Externa Passing Juice
“P0542: Support for contract based programming in C++” Externa Passing Juice
P0515 Externa Passing Juice
P0893 Externa Passing Juice
“I.12 Declare a pointer that must not be null as not_null” Externa Passing Juice
Herb Sutter Interna Passing Juice
C++ Interna Passing Juice
GotW Interna Passing Juice
Uncategorized Interna Passing Juice
9 Comments Interna Passing Juice
GotW #101: Preconditions, Part 2 (Difficulty: 7/10) Interna Passing Juice
GotW #100 Solution: Preconditions, Part 1 (Difficulty: 8/10) Interna Passing Juice
#97 Interna Passing Juice
#99 Interna Passing Juice
Trip report: Winter 2021 ISO C++ standards meeting (virtual) Interna Passing Juice
priorities Externa Passing Juice
schedule Externa Passing Juice
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Upcoming Meetings page Externa Passing Juice
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GotW #100: Preconditions, Part 1 (Difficulty: 8/10) Interna Passing Juice
4 Comments Interna Passing Juice
“P0052: Generic Scope Guard and RAII Wrapper for the Standard Library” Externa Passing Juice
“Change the Way You Write Exception-Safe Code – Forever” Externa Passing Juice
compose Externa Passing Juice
11 Comments Interna Passing Juice
GotW #99: Postconditions (Difficulty: 7/10) Interna Passing Juice
5 Comments Interna Passing Juice
assumes what we want to prove Externa Passing Juice
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GotW #98: Assertion levels (Difficulty: 5/10) Interna Passing Juice
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shift-left Externa Passing Juice
shift-right Externa Passing Juice
belt-and-suspenders Externa Passing Juice
“Planning and Coding of problems for an Electronic Computing Instrument” Externa Passing Juice
“Checking a Large Routine” Externa Passing Juice
“P0542: Support for contract based programming in C++” Externa Passing Juice
spdlog: Fast C++ logging library Externa Passing Juice
Event Tracing for Windows (ETW) Externa Passing Juice
“P2064: Assumptions” Externa Passing Juice
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Tweets Externa Passing Juice
isocpp Externa Passing Juice
bit.ly/3rSiLGF Externa Passing Juice
#cpp Externa Passing Juice
2 weeks ago Externa Passing Juice
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SEO Nyckelord
Nyckelord Moln using because all abstraction preconditions precondition wrong type auto int
Nyckelord Konsistens
Nyckelord Innehåll Titel Nyckelord Beskrivning Rubriker
int 32
wrong 29
type 29
using 24
preconditions 24

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Url Domän : herbsutter.com
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Doctype HTML 5
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W3C Validity Errors : 3
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