Add sem03

2 files changed, 88 insertions, 0 deletions

diff --git a/Seminar03/src/dynamic-array/examples/placement-new-memory-strategy.cpp b/Seminar03/src/dynamic-array/examples/placement-new-memory-strategy.cpp
new file mode 100644
index 0000000..693b95c
--- /dev/null
+++ b/Seminar03/src/dynamic-array/examples/placement-new-memory-strategy.cpp
@@ -0,0 +1,27 @@
+#include <iostream>
+
+struct E
+{
+    E()
+    {
+        std::cout << "constr" << std::endl;
+    }
+
+    ~E()
+    {
+        std::cout << "destr" << std::endl;
+    }
+};
+
+int main()
+{
+    std::cout << "operator new called" << std::endl;
+    E* e = static_cast<E*>(operator new(sizeof(E)));
+    std::cout << "placement new called" << std::endl;
+    new (e) E();
+
+    std::cout << "destructor manually called" << std::endl;
+    e->~E();
+    std::cout << "operator delete called" << std::endl;
+    operator delete(e, sizeof(E));
+}
\ No newline at end of file
diff --git a/Seminar03/src/dynamic-array/examples/variadic-templates.cpp b/Seminar03/src/dynamic-array/examples/variadic-templates.cpp
new file mode 100644
index 0000000..291d81a
--- /dev/null
+++ b/Seminar03/src/dynamic-array/examples/variadic-templates.cpp
@@ -0,0 +1,61 @@
+#include <iostream>
+
+// std::forward example - preserve the value category (lvalue or rvalue)
+void f(const int& x)
+{
+    std::cout << "lvalue" << std::endl;
+}
+
+void f(const int&& x)
+{
+    std::cout << "rvalue" << std::endl;
+}
+
+template<class T>
+void g(T&& x)
+{
+    f(std::forward<T>(x));
+}
+
+struct printer
+{
+    static void print()
+    {
+        std::cout << std::endl;
+    }
+
+    template<class T, class... Args>
+    static void print(const T& first, const Args&... args)
+    {
+        std::cout << first << " ";
+        print(std::forward<const Args&>(args)...);
+    }
+};
+
+struct Entity
+{
+    int x;
+    friend std::ostream& operator<<(std::ostream& os, const Entity& e);
+
+    Entity(int x_) : x(x_) {}
+
+    Entity(Entity&)
+    {
+        std::cout << "Copied " << x << std::endl;
+    }
+};
+
+std::ostream& operator<<(std::ostream& os, const Entity& e)
+{
+    os << e.x;
+    return os;
+}
+
+int main()
+{
+    int x = 10;
+    g(x);
+
+    g(std::move(x));
+
+}
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