applepieisgood - Developer IT

Opteron 1212 vs. Xeon 3050?

- by ApplePieIsGood

Any major reason I should chose AMD over Intel here?

Need explanation for this boost::asio timer example

There is a line in the 3rd tutorial on Boost asio that shows how to renew a timer and yet prevent there from being drift. The line is the following: t->expires_at(t->expires_at() + boost::posix_time::seconds(1)); Maybe it's me but I wasn't able to find documentation on the 2nd usage of expires_at(), with no parameters. expires_at(x) sets the new expiration, cancelling any pending completion handlers. So presumably expires_at() does what, return time of the last expiry? So by adding one second, if there should be some number of ms, say n ms, then it will in essence be "subtracted" from the next expiry since the time is being accounted for? What happens then if the time it takes to perform this handler is greater than 1 second in this example? Does it fire immediately?

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When does an asio timer go out of scope?

- by ApplePieIsGood

What I mean is, let's say you do an async_wait on an asio timer and bind the update to a function that takes a reference to a type T. Let's say you created the T initially on the stack before passing it to async_wait. At the end of that async_wait, it calls async_wait itself, renewing the timer over and over. Does that stack allocated type T stay alive until the first time the timer doesn't renew itself, or after the first invocation of the function will the T go out of scope?

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What are some good algorithms for drawing lines between graph nodes?

- by ApplePieIsGood

What I'm specifically grappling with is not just the layout of a graph, but when a user selects a graph node and starts to drag it around the screen area, the line has to constantly be redrawn to reflect what it would look like if the user were to release the node. I suppose this is part of the layout algorithm? Also some applications get a bit fancy and don't simply draw the line in a nice curvy way, but also bend the line around the square shaped node in almost right angles. See attached image and keep in mind that as a node is dragged, the line is drawn as marching ants, and re-arranged nicely, while retaining its curved style.

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Has the small object allocator found in "Modern C++ Design"/Loki been deprecated in favor of newer i

- by ApplePieIsGood

It seems the code and the book have been relegated to the foundation of the movement of modern C++, and isn't updated any more. Is there some kind of replacement for this in Boost or TR1?

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Is using macros to abbreviate long winded boost template names a bad practice?

- by ApplePieIsGood

I am tired of writing shared_ptr<, it's lengthening the code lines tremendously. Any reason not to do this?

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What is a good CPU/PC setup to speed up intensive C++/templates compilation?

- by ApplePieIsGood

I currently have a machine with an Opteron 275 (2.2Ghz), which is a dual core CPU, and 4GB of RAM, along with a very fast hard drive. I find that when compiling even somewhat simple projects that use C++ templates (think boost, etc.), my compile times can take quite a while (minutes for small things, much longer for bigger projects). Unfortunately only one of the cores is pegged at 100%, so I know it's not the I/O, and it would seem that there is no way to take advantage of the other core for C++ compilation?

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What are your top 10 (or more) must have tools or apps for your C++ development?

- by ApplePieIsGood

Looking for the things you install every time you do a fresh build and use either frequently or infrequently but it may be very novel and obscure and have a lot of value to a C++ developer's toolbox.

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Do you have a hard time keeping to 80 columns with Python?

- by ApplePieIsGood

I find myself breaking strings constantly just to get them on the next line. And of course when I go to change those strings (think logging messages), I have to reformat the breaks to keep them within the 80 columns. How do most people deal with this?

Developer IT