added tool to pretty-print type names

Examples/CONTENT.md

@@ -87,6 +87,7 @@ since several examples make use of the utilities contained in this folder.
     * `Streams/redirect`. Straems can be redirected, also at run time!. Useful you you want to be able to switch from screen to file, or to a string.
     * `Streams/serialization`. A  example of serializaion of an aggregate (more complex serialization that may be performed with specialised libraries like `boost::serialization` are not covered here).
     * `Streams/sstream`. String streams are a very useful tool. They are strings that can act as a stream (or viceversa). Here you find some example of usage.
+    * `Streams/format` An example of the use of the new `std::format` utility. It is a new feature in C++20 that allows you to format strings in a more readable and maintainable way. It is similar to `printf` but with a more modern syntax. 
   * `Vector` Examples of use of `std::vector`, probably the most used container in C++.
     *`Vector/Basics` As the name says.
     *`Vector/Remove` What it means "removing" elements from a vector with `remove()`. It is not what you think!`

Examples/src/Utilities/README.md

@@ -88,11 +88,10 @@ utilities of the Standard Library, but with a simpler interface.
 
 * `toString` Converts anything for which there is the `<<` streaming operator to a string. A use of `std::stringstream`.
 
-* `tuple_utilities` Contains some utilities for tuples:  `tuple_common_type_t<Tuple>` that returns the common tpe of all types contained in a tuple, and `for_each<Tuple F>` and `for_each2<Tuple, F>` that apply (possibly in parallel) the function object `F` to all elements of the tuple. The first one returns a tuple with the result, the second one does not and is thus applicable also if `F` is a void function. `all_of<Tuple,F>` and `any_of<Tuple,F>`, that apply predicate `F` to all elements of a tuple. The first returns true if the predicate is true for all elements, the second if it is true for at least one element.
-
-
-
+* `tuple_utilities.hpp` Contains some utilities for tuples:  `tuple_common_type_t<Tuple>` that returns the common tpe of all types contained in a tuple, and `for_each<Tuple F>` and `for_each2<Tuple, F>` that apply (possibly in parallel) the function object `F` to all elements of the tuple. The first one returns a tuple with the result, the second one does not and is thus applicable also if `F` is a void function. `all_of<Tuple,F>` and `any_of<Tuple,F>`, that apply predicate `F` to all elements of a tuple. The first returns true if the predicate is true for all elements, the second if it is true for at least one element.
 
+* `type_name.hpp` An utility to pretty-print the name of the type of a variable. It is useful for debugging. It is based on the `boost::core::demangle` function. 
+
 ** Note ** `Factory.hpp` and `Proxy.hpp` are in fact links to the same file in the folder `GenericFactory`. If the files are not present for some reason you may safely copy in `Utility/` the files in `GenericFactory/`.
 
 

Examples/src/Utilities/test_type_name.cpp

@@ -0,0 +1,12 @@
+#include "type_name.hpp"
+#include <iostream>
+int
+main()
+{
+  std::cout << apsc::type_name<int>() << std::endl;
+  std::cout << apsc::type_name<double>() << std::endl;
+  double *x = new double[10];
+  std::cout << apsc::type_name<decltype(x)>() << std::endl;
+  std::cout << apsc::type_name<std::string>() << std::endl;
+  return 0;
+}

Examples/src/Utilities/type_name.hpp

@@ -0,0 +1,36 @@
+#pragma once
+// code based on
+// https://stackoverflow.com/questions/81870/is-it-possible-to-print-a-variables-type-in-standard-c
+#include <string_view>
+/*!
+@brief Get the type name of a variable
+@tparam T Type of the variable
+@return The type name of the variable
+@note possible usage:
+@code
+template <class T>
+void foo(const T& variable)
+{
+    std::cout << type_name<T>() << std::endl;
+}
+@endcode
+*/
+namespace apsc
+{
+template <class T>
+constexpr std::string_view
+type_name()
+{
+#ifdef __clang__
+  std::string_view p = __PRETTY_FUNCTION__;
+  return std::string_view(p.data() + 34, p.size() - 34 - 1);
+#elif defined(__GNUC__)
+  std::string_view p = __PRETTY_FUNCTION__;
+#if __cplusplus < 201402
+  return std::string_view(p.data() + 36, p.size() - 36 - 1);
+#else
+  return std::string_view(p.data() + 49, p.find(';', 49) - 49);
+#endif
+#endif
+}
+} // namespace apsc