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herbsutter.com

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 Generado el 21 Abril 2021 09:39 AM

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Título

Sutter’s Mill – Herb Sutter on software development



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Herb Sutter on software development



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Propiedad Contenido
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
Titulos
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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Ratio Texto/HTML Ratio : 16%

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Skip to content Interna Pasando Jugo
Sutter’s Mill Interna Pasando Jugo
GotW #101 Solution: Preconditions, Part 2 (Difficulty: 7/10) Interna Pasando Jugo
GotW #98 Interna Pasando Jugo
“Contracts, preconditions and invariants” Externo Pasando Jugo
“P0542: Support for contract based programming in C++” Externo Pasando Jugo
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“I.12 Declare a pointer that must not be null as not_null” Externo Pasando Jugo
Herb Sutter Interna Pasando Jugo
C++ Interna Pasando Jugo
GotW Interna Pasando Jugo
Uncategorized Interna Pasando Jugo
9 Comments Interna Pasando Jugo
GotW #101: Preconditions, Part 2 (Difficulty: 7/10) Interna Pasando Jugo
GotW #100 Solution: Preconditions, Part 1 (Difficulty: 8/10) Interna Pasando Jugo
#97 Interna Pasando Jugo
#99 Interna Pasando Jugo
Trip report: Winter 2021 ISO C++ standards meeting (virtual) Interna Pasando Jugo
priorities Externo Pasando Jugo
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Upcoming Meetings page Externo Pasando Jugo
2 Comments Interna Pasando Jugo
GotW #100: Preconditions, Part 1 (Difficulty: 8/10) Interna Pasando Jugo
4 Comments Interna Pasando Jugo
“P0052: Generic Scope Guard and RAII Wrapper for the Standard Library” Externo Pasando Jugo
“Change the Way You Write Exception-Safe Code – Forever” Externo Pasando Jugo
compose Externo Pasando Jugo
11 Comments Interna Pasando Jugo
GotW #99: Postconditions (Difficulty: 7/10) Interna Pasando Jugo
5 Comments Interna Pasando Jugo
assumes what we want to prove Externo Pasando Jugo
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GotW #98: Assertion levels (Difficulty: 5/10) Interna Pasando Jugo
11 Comments Interna Pasando Jugo
shift-left Externo Pasando Jugo
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belt-and-suspenders Externo Pasando Jugo
“Planning and Coding of problems for an Electronic Computing Instrument” Externo Pasando Jugo
“Checking a Large Routine” Externo Pasando Jugo
“P0542: Support for contract based programming in C++” Externo Pasando Jugo
spdlog: Fast C++ logging library Externo Pasando Jugo
Event Tracing for Windows (ETW) Externo Pasando Jugo
“P2064: Assumptions” Externo Pasando Jugo
18 Comments Interna Pasando Jugo
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bit.ly/3rSiLGF Externo Pasando Jugo
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Palabras Clave SEO
Nube de Palabras Clave type precondition abstraction wrong int because auto all using preconditions
Consistencia de las Palabras Clave
Palabra Clave (Keyword) Contenido Título Palabras Claves (Keywords) Descripción Titulos
int 32
wrong 29
type 29
using 24
preconditions 24

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