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herbsutter.com

Webseiten-Bericht für herbsutter.com

 Generiert am 21 April 2021 09:39 AM

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Seitentitel

Sutter’s Mill – Herb Sutter on software development



Länge : 51

Perfekt, denn Ihr Seitentitel enthält zwischen 10 und 70 Anzahl Zeichen.
Seitenbeschreibung

Herb Sutter on software development



Länge : 35

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Eigenschaft Inhalt
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
Überschriften
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 Verhältnis Anteil : 16%

Gut, denn das Text zu HTML Code Verhältnis dieser Webseite ist höher als 15, aber niedriger als 25 Prozent.
Flash Perfekt, denn es wurde kein Flash auf Ihrer Webseite gefunden.
IFrame Großartig, denn Sie verwenden keine IFrames auf Ihrer Webseite.

URL Rewrite Gut. Ihre Links sind für Suchmaschinen gut lesbar (sprechende Links)!
Underscores in the URLs Perfekt! Wir haben keine Unterstriche in Ihren Links entdeckt.
In-page links We found a total of 197 links including 2 link(s) to files



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

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