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Posted by jpluimers on 2020/06/16
[WayBack] A Tale of Many Divisions – Naive Prime Factorization Across a Handful of Architectures
Source code: [WayBack] GitHub – blu/euclid: An extremely naive prime factorizer
Via: [WayBack] Blu looks at how a small piece of code with divisions surprisingly behave on various architecture: #Arm, #MIPS, and #x86. – Jean-Luc Aufranc – Google+
–jeroen
Posted in Assembly Language, C++, Development, Software Development | Leave a Comment »
Posted by jpluimers on 2020/04/30
This is a nice joke: [WayBack] The Invention of C++ – Nice bit of net lore.
But the actual interview linked from the article is quite nice: [WayBack: The Real Stroustrup Interview]
By the name, I found the actual (hopefully still online when this gets out of the blog post queue) version at [WayBack] Stroustrup: Interviews under [WayBack] stroustrup.com/ieee_interview.pdf
–jeroen
Via: [WayBack] The invention of C++ – Thomas Mueller (dummzeuch) – Google+
Posted in C, C++, Development, History, Software Development | Leave a Comment »
Posted by jpluimers on 2020/01/29
Via [WayBack] As far as I can tell (and documentation on that is reaaaaaaly hard to find), dcc64 can link in .obj files in OMF and COFF format. Bcc64 uses LLVM chain and therefore produces ELF .o files… – Primož Gabrijelčič – Google+:
David Heffernan:
dcc32doescoffandomf,dcc64onlycoffand later he commented:
One of the difficulties with linking objects is the handling of exceptions. The 64 bit exception model is table based, in contrast to the stack based 32 bit model.
I don’t think that the exception tables are written correctly for code linked in objects. If exceptions are raised then this can lead to abnormal process termination. Process just disappears. Poof!
One common way that this happens is floating point exceptions that are by default unmasked by the Delphi RTL. I have found it necessary to mask them when calling into any linked object code to avoid exceptions being raised.
And compiling with cl can be a bit of a game. It’s stack checking options need to be disabled. And there are a few other key switches that help. And then there’s the forward declaration trick to help the one pass compiler cope with C objects that are expected to be linked in a separate step.
Anyway, it can be quite a challenge at times, but I’ve yet to find a plain self contained C library that has defeated me!
–jeroen
Posted in C++, C++ Builder, Delphi, Delphi x64, Development, Software Development, Visual Studio C++ | 2 Comments »
Posted by jpluimers on 2019/12/25
For my link archive: [Archive.is] Flexible and Economical UTF-8 Decoder.
Be sure to read the whole article there as the explanation of the initial algorithm is important and final algorithm is towards the end.
The foundation is a state machine combined with a lookup table to find the initial state and proceed to subsequent states.
Related (and reminder to check what David did):
–jeroen
Posted in C, C++, Delphi, Development, Software Development | 1 Comment »
Posted by jpluimers on 2019/10/10
[WayBack] Abtruse Goose: Teach Yourself C++ in 21 days…
Via: [WayBack] “How to learn programming in 21 Days” – CodeProject – Google+
Posted in C, C++, Development, Fun, Software Development | Leave a Comment »
Posted by jpluimers on 2019/07/16
Design Patterns and Refactoring articles and guides. Design Patterns video tutorials for newbies. Simple descriptions and full source code examples in Java, C++, C#, PHP and Delphi.
Source: [WayBack] Design Patterns & Refactoring.
And indeed a lot of examples in Delphi too; few sites have that: Delphi site:sourcemaking.com.
–jeroen
Via: [WayBack] I stumbled upon this yesterday, very informative, accessible and also with Delphi examples – among other languages. – Steffen Nyeland – Google+
Posted in .NET, C, C#, C++, Delphi, Design Patterns, Development, Java, Java Platform, PHP, Scripting, Software Development | Leave a Comment »
Posted by jpluimers on 2019/05/21
Context is king!
Being Dutch, my association with iota was the phrase “Ik snap er geen iota van” (English: “It’s all Greek to me”), basically indicating iota is extremely small, similar to [WayBack] Iota | Definition of Iota by Merriam-Webster:
2: the 9th letter of the Greek alphabet — see alphabet table
But the first time, I saw iota used in golang, I actually confused it with [WayBack] itoa – C++ Reference, because I am more than slightly wordblind.
So code like this was all Greek to me at first, not understanding the conversion from integer to ASCII**, and slightly later, not understanding iota to be extremely small either. Heck, its usage indicates it is small from infinitesimal:
const ( _ = iota // ignore first value by assigning to blank identifier KB ByteSize = 1 << (10 * iota) MB GB TB PB EB ZB YB )
So it took me a bit of thought to realise that it actually had to mean something completely different, so I found
iota count [start step] -> listReturns a list containing the elementsIt makes me wonder why they named it like this.
Slightly related:
Q
In the C language where did they come up with the name atoi for converting a string to an integer? The only thing I can think of is Array To Integer for an acronym but that doesn’t really make sense.
A
It means Ascii to Integer. Likewise, you can have
atolfor Ascii to Long,atoffor Ascii to Float, etc.A Google search for ‘atoi “ascii to integer”‘ confirms this on several pages.
I’m having trouble finding any official source on it… but in this listing of man pages from Third Edition Unix (1973) collected by Dennis Ritchie himself, it does contain the line:
atoi(III): convert ASCII to integerIn fact, even the first edition Unix (ca 1971) man pages list
atoias meaning Ascii to Integer.So even if there isn’t any documentation more official than man pages indicating that
atoimeans Ascii to Integer (I suspect there is and I just haven’t been able to locate it), it’s been Ascii to Integer by convention at least since 1971.
atoi -- ascii to integer–jeroen
Posted in C++, Development, Go (golang), Software Development | Leave a Comment »
Posted by jpluimers on 2019/05/15
One more thing to take away from Procedural Programming: It’s Back? It Never Went Away – Kevlin Henney [ACCU 2018] – YouTube was explained in [WayBack] How to Design Early Returns in C++ (Based on Procedural Programming) – Fluent C++.
Though in C++, it applies to all programming languages that stem from a procedural background (Pascal, C#, Java, golang, to name just a few).
The article is about keeping an if/else-if/else tree, even when they can be removed becomes some of their bodies perform an early return, as
In C++, as well as in other languages, the
returnkeyword has two responsibilities:
- interrupting control flow,
- yielding a value.
It basically comes down to this argument:
Essentially, the argument for Code #1 is that you need to know less to understand the structure of the code.
Indeed, if we fold away the contents of the if statements, Code #1 becomes this:
The structure of the code is very clear. There are 4 different paths based on the
year, they’re independent from each other, and each path will determine the boolean result of the function (if it doesn’t throw an exception).Now let’s see how Code #2 looks like when we fold away the if statements:
And now we know much less. Do the if statements contain a
return? Maybe.Do they depend on each other? Potentially.
Do some of them rely on the last
return falseof the function? Can’t tell.With Code #2, you need to look inside of the if statement to understand the structure of the function. For that reason, Code #1 requires a reader to know less to understand the structure. It gives away information more easily than Code #2.
–jeroen
via [WayBack] Kevlin Henney – Google+: How to Design Early Returns in C++ (Based on Procedural Programming) – Fluent C++
Posted in .NET, C, C#, C++, Conference Topics, Conferences, Delphi, Development, Event, Software Development | Leave a Comment »
Posted by jpluimers on 2019/03/27
The list below is based on a G+ discussion in a single language, but has way broader aspects.
It’s on value types, mutability, parameterless constructors and expectations of compiled code.
I’ve bitten myself in the foot with mutable types in too many languages too often, so I started advocating this years ago at clients, and now in this blog-post.
TL;DR:
Posted in .NET, C#, C++, Delphi, Development, Jon Skeet, Software Development | 2 Comments »
Posted by jpluimers on 2019/03/05
[WayBack] gdbgui – browser based debugger for C, C++, go, rust, Fortran. Modern gdb frontend.: gdbgui (gnu debugger graphical user interface)
Via: [WayBack] Browser-based debugger for C, C++, go, rust, and more – written in Python with Flask. https://github.com/cs01/gdbgui Easy installation via PyPI: pip i… – Joe C. Hecht – Google+
–jeroen
Posted in C, C++, Debugging, Development, Fortran, GDB, Go (golang), Python, Scripting, Software Development | Leave a Comment »
The Wiert Corner - irregular stream of stuff 