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Clang optimization levels
...echo 'int;' | clang -xc -O3 - -o /dev/null -\#\#\#
Documentation of individual passes is available here.
With version 6.0 the passes are as follow:
baseline (-O0):
opt sets: -tti -verify -ee-instrument -targetlibinfo -assumption-cache-tracker -profile-summary-info -forceattrs -basiccg -al...
What is the correct way of using C++11's range-based for?
...container
vs. modifying them in place.
Observing the elements
Let's consider a simple example:
vector<int> v = {1, 3, 5, 7, 9};
for (auto x : v)
cout << x << ' ';
The above code prints the elements (ints) in the vector:
1 3 5 7 9
Now consider another case, in which ...
MQTT与TCP的区别 - 创客硬件开发 - 清泛IT社区，为创新赋能！
...IoT概念也是在1999年，因此MQTT协议生逢其时。当时MIT Auto-ID Labs的Kevin Ashton为了把宝洁的供应链上的RFID标签和互联网连接起来，在1999年第一个提出了IoT这个概念。发明人TCP协议的发明人是Vinton Cerf（下图左，曾在IBM工作过两年）...
What's the difference between __PRETTY_FUNCTION__, __FUNCTION__, __func__?
..._ , __FUNCTION__ , __func__ , and where are they documented? How do I decide which one to use?
5 Answers
...
Memcached vs. Redis? [closed]
...ments, or anything else that might be expensive to generate.
Points to Consider
When used for the same thing, here is how they compare using the original question's "Points to Consider":
Read/write speed: Both are extremely fast. Benchmarks vary by workload, versions, and many other factors but gen...
What is the maven-shade-plugin used for, and why would you want to relocate Java packages?
...ll JARs to run your app. It also ease distribution in some case.
Just a side-note. Avoid using uber-jar as Maven dependency, as it is ruining the dependency resolution feature of Maven. Normally we create uber-jar only for the final artifact for actual deployment or for manual distribution, but ...
How to center a checkbox in a table cell?
The cell contains nothing but a checkbox. It is rather wide because of text in the table header row. How do I center the checkbox (with inline CSS in my HTML? (I know))
...
Generating an MD5 checksum of a file
...y warnings, that is perfectly good use of MD5.
– President James K. Polk
Aug 7 '10 at 20:09
22
@G...
Pass a data.frame column name to a function
...,"x","y")
x y z
1 1 5 6
2 2 6 8
3 3 7 10
4 4 8 12
This is often considered "best practice" since it is the method that is hardest to screw up. Passing the column names as strings is about as unambiguous as you can get.
The following two options are more advanced. Many popular packages make u...
How to convert a Drawable to a Bitmap?
...
URL url_value = new URL(name);
ImageView profile = (ImageView)v.findViewById(R.id.vdo_icon);
if (profile != null) {
Bitmap mIcon1 =
BitmapFactory.decodeStream(url_value.openConnection().getInputStream());
profile.setImageBitmap(mIcon1);
}
...