Added examples

.gitignore

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+build

README.md

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 # PACS
-Official repository of the Programming and Architecture of Computing Systems course of the MS in Robotics, Graphics, and Computer Vision
+
+Official repository of the Programming and Architecture of Computing Systems
+course of the MS in Robotics, Graphics, and Computer Vision
+
+## Code snippets from Class
+
+The directory `code_examples` contains many of the small C++ programs and
+fragments from the slides.
+
+To compile them, you can use `cmake`. For example:
+
+```bash
+cd code_examples
+mkdir build
+cd build
+cmake ../ # generate the Makefile with cmake
+make # compile the examples
+ls # list the examples
+```

code_examples/CMakeLists.txt

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+cmake_minimum_required (VERSION 3.1)
+project (PACS_EXAMPLES)
+
+set(CMAKE_CXX_STANDARD 11)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+
+if (MSVC)
+    # warning level 4 and all warnings as errors
+    add_compile_options(/W4 /WX)
+else()
+    # lots of warnings and all warnings as errors
+    add_compile_options(-Wall -Wextra -pedantic -Werror)
+endif()
+
+add_executable(hello_pacs hello_pacs.cc)
+add_executable(thread_joinable thread_joinable.cc)
+add_executable(hello_pacs_two_threads hello_pacs_two_threads.cc)

code_examples/hello_pacs.cc

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+#include <iostream>
+#include <thread>
+
+void hello() {
+    std::cout << "Hello PACS" << std::endl;
+}
+
+int main() {
+     std::thread t(hello);
+     t.join(); // wait for completion
+}
+

code_examples/hello_pacs_two_threads.cc

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+#include <chrono>
+#include <iostream>
+#include <thread>
+
+using namespace std::chrono;
+
+void hello() {
+    while(1) {
+        std::cout << "Hello" << std::endl;
+        std::this_thread::sleep_for(milliseconds(300));
+    }
+}
+
+int main() {
+    std::thread t(hello); // thread creation
+    while(1) {
+        std::cout << "PACS" << std::endl;
+        std::this_thread::sleep_for(milliseconds(300));
+    }
+}
+

code_examples/thread_joinable.cc

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+#include <iostream>
+#include <thread>
+#include <chrono>
+
+void foo()
+{
+    std::this_thread::sleep_for(std::chrono::seconds(1));
+}
+
+int main()
+{
+    std::thread t;
+    std::cout << "before starting, joinable: " << std::boolalpha << t.joinable()
+        << '\n';
+
+    t = std::thread(foo);
+    std::cout << "after starting, joinable: " << t.joinable()
+        << '\n';
+
+    t.join();
+    std::cout << "after joining, joinable: " << t.joinable()
+        << '\n';
+}