Tutorial by Examples: ci

The notation 'thing is equal to (quote thing). The reader will do the expansion: > (read-from-string "'a") (QUOTE A) Quoting is used to prevent further evaluation. The quoted object evaluates to itself. > 'a A > (eval '+ 1 2) 3

By default, containers created with docker run are given a random hostname. You can give the container a different hostname by passing the --hostname flag: docker run --hostname redbox -d ubuntu:14.04

git diff myfile.txt Shows the changes between the previous commit of the specified file (myfile.txt) and the locally-modified version that has not yet been staged. This also works for directories: git diff documentation The above shows the changes between the previous commit of all files in ...

There are different cases where you must Explicitly specify the type parameters for a generic method. In both of the below cases, the compiler is not able to infer all of the type parameters from the specified method parameters. One case is when there are no parameters: public void SomeMethod<T...

You can get an specific information from a container by running: docker inspect -f '<format>' <container> For instance, you can get the Network Settings by running: docker inspect -f '{{ .NetworkSettings }}' <container> You can also get just the IP address: docker inspect ...

Floating point numbers of type real cannot have any real value. They can represent real numbers up to certain amount of decimal digits. FORTRAN 77 guaranteed two floating point types and more recent standards guarantee at least two real types. Real variables may be declared as real x double prec...

You can commit changes made to specific files and skip staging them using git add: git commit file1.c file2.h Or you can first stage the files: git add file1.c file2.h and commit them later: git commit

In some cases you may want to wrap a synchronous operation inside a promise to prevent repetition in code branches. Take this example: if (result) { // if we already have a result processResult(result); // process it } else { fetchResult().then(processResult); } The synchronous and async...

Travis CI has CMake 2.8.7 pre-installed. A minimal .travis.yml script for an out-of source build language: cpp compiler: - gcc before_script: # create a build folder for the out-of-source build - mkdir build # switch to build directory - cd build # run cmake; here we assume...

The CMake version preinstalled on Travis is very old. You can use the official Linux binaries to build with a newer version. Here is an example .travis.yml: language: cpp compiler: - gcc # the install step will take care of deploying a newer cmake version install: # first we creat...

int a = 1; int *a_pointer = &a; To dereference a_pointer and change the value of a, we use the following operation *a_pointer = 2; This can be verified using the following print statements. printf("%d\n", a); /* Prints 2 */ printf("%d\n", *a_pointer); /* Also prints...

std::async is also able to make threads. Compared to std::thread it is considered less powerful but easier to use when you just want to run a function asynchronously. Asynchronously calling a function #include <future> #include <iostream> unsigned int square(unsigned int i){ r...

To find all the files of a certain extension within the current path you can use the following find syntax. It works by making use of bash's built-in glob construct to match all the names having the .extension. find /directory/to/search -maxdepth 1 -type f -name "*.extension" To find ...

Bear in mind that declaring a destructor inhibits the compiler from generating implicit move constructors and move assignment operators. If you declare a destructor, remember to also add appropriate definitions for the move operations. Furthermore, declaring move operations will suppress the genera...

"dependencies": { "module-name": "0.1.0" } exact: 0.1.0 will install that specific version of the module. newest minor version: ^0.1.0 will install the newest minor version, for example 0.2.0, but won't install a module with a higher major version e.g. 1.0.0 newe...

This example shows, how to make a UIView or UIImageView, rounded with some radius like this: Objective-C someImageView.layer.cornerRadius = CGRectGetHeight(someImageView.frame) / 2; someImageView.clipsToBounds = YES; Swift someImageView.layer.cornerRadius = someImageView.frame.height/2 // ...

Create a circle image with glide. public class CircleTransform extends BitmapTransformation { public CircleTransform(Context context) { super(context); } @Override protected Bitmap transform(BitmapPool pool, Bitmap toTransform, int outWidth, int outHeight) { ret...

The strchr and strrchr functions find a character in a string, that is in a NUL-terminated character array. strchr return a pointer to the first occurrence and strrchr to the last one. #include <stdio.h> #include <stdlib.h> #include <string.h> int main(void) { char toSe...

You can define implementation for specific instantiations of a template class/method. For example if you have: template <typename T> T sqrt(T t) { /* Some generic implementation */ } You can then write: template<> int sqrt<int>(int i) { /* Highly optimized integer implement...

The cx and cy values designate the location of the center of the circle. The r attribute specifies the size of the radius of the circle. <svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"> <circle cx="40" cy="40&q...