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Is optimisation level -O3 dangerous in g++?
I have heard from various sources (though mostly from a colleague of mine), that compiling with an optimisation level of -O3 in g++ is somehow 'dangerous', and should be avoided in general unless proven to be necessary.
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Eclipse: How do i refresh an entire workspace? F5 doesn't do it
... Problem with this is though, that if any of my projects are closed (which is all the time), the Refresh option does not appear. The only way Ctrl+A followed by F5 works for me is if all my projects are open.
– Matt
Feb 21 '11 at 10:19
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ValueError: numpy.dtype has the wrong size, try recompiling
...iled extension of the package (for exception see below).
Distributers of those other packages do not need to recompile their package against a newer versions of numpy and users do not need to update these other packages, when users update to a newer version of numpy.
However, this does not go in t...
How to disable “Save workspace image?” prompt in R?
... answered Feb 14 '11 at 19:12
Joshua UlrichJoshua Ulrich
157k2929 gold badges308308 silver badges388388 bronze badges
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How to start two threads at “exactly” the same time
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To start the threads at exactly the same time (at least as good as possible), you can use a CyclicBarrier:
// We want to start just 2 threads at the same time, but let's control that
// timing from the main thread. That's why we have 3 "parties" instead of 2.
final CyclicBarrier gate = new ...
CMFCTabCtrl的使用、颜色样式调整 - C/C++ - 清泛网 - 专注C/C++及内核技术
...式，AutoColor自动设置Tab颜色效果等。1.在指定位置处创建一个CMFCTabCtrl，并给其添加4个CEdit:
CRect rectTab;
CEdit m_wnd1;
CEdit m_wnd2;
CEdit m_wnd3;
CEdit m_wnd4;
CMFCTabCtrl m_wndTab;
m_wndTabLoc.GetWindowRect (&rectTab);
ScreenToClient (&rectTab);
m_wnd...
How to export iTerm2 Profiles
...d to do is save your settings first and load it after you reinstalled your OS.
If the Save settings to Folder is disabled, select a folder (e.g. empty) in the Load preferences from a custom folder or URL: text box.
In iTerm2 3.3 on OSX the sequence is: iTerm2 menu, Preferences, General tab, Prefer...
What is the Haskell response to Node.js?
...lack of a thread abstraction to be a disadvantage. I'd disagree with his position, particularly in the context of Haskell: I think the abstractions that threads provide are essential for making server code easier to get right, and more robust. In particular:
using one thread per connection lets ...
How to select a CRAN mirror in R
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You should either get a window with a list of repositories or a text menu with some options. But if that is not appearing, you can always specify the mirror from where to download the packages yourself by using repos parameter. By doing that, R will not ask you anymore abou...
process.env.NODE_ENV is undefined
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To set an environment variable in Windows:
SET NODE_ENV=development
on OS X or Linux:
export NODE_ENV=development
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