add some examples

Author: liss-h

README.md

@@ -64,6 +64,9 @@ The primary use-case for this is on-the-fly RAII-like resource management for ty
 Usage examples can be found [here](examples/examples_defer.cpp).
 
 
+### `tuple algorthims`
+Some algorithms for iterating tuples, for example `tuple_fold` a fold/reduce implementation for tuples.
+
 ### Further Examples
 
 Compilable code examples can be found in [examples](./examples). The example build requires the cmake

examples/CMakeLists.txt

@@ -43,4 +43,11 @@ add_executable(examples_defer
 target_link_libraries(examples_defer
         PRIVATE
         dice-template-library::dice-template-library
+)
+
+add_executable(examples_tuple_algorithm
+        examples_tuple_algorithm.cpp)
+target_link_libraries(examples_tuple_algorithm
+        PRIVATE
+        dice-template-library::dice-template-library
 )

examples/examples_tuple_algorithm.cpp

@@ -0,0 +1,51 @@
+#include <dice/template-library/tuple_algorithm.hpp>
+
+#include <cassert>
+#include <iostream>
+#include <limits>
+#include <tuple>
+
+void tuple_fold() {
+	std::tuple<int, double, float, long> tup{5, 1.2, 1.3F, 1L};
+
+	auto const sum = dice::template_library::tuple_fold(tup, 0L, [](auto acc, auto x) {
+		return acc + static_cast<long>(x);
+	});
+
+	assert(sum == 8);
+}
+
+void tuple_type_fold() {
+	using tuple_t = std::tuple<int, long>;
+
+	auto const digits_sum = dice::template_library::tuple_type_fold<tuple_t>(0UL, []<typename T>(auto acc) {
+		return acc + std::numeric_limits<T>::digits10;
+	});
+
+	assert(digits_sum == 27);
+}
+
+void tuple_for_each() {
+	std::tuple<int, double, float> tup{1, 1.0, 1.0F};
+
+	dice::template_library::tuple_for_each(tup, [](auto &x) {
+		x += 1;
+	});
+
+	assert((tup == std::tuple<int, double, float>{2, 2.0, 2.0F}));
+}
+
+void tuple_type_for_each() {
+	using tuple_t = std::tuple<int, double, float>;
+
+	dice::template_library::tuple_type_for_each<tuple_t>([&]<typename T>() {
+		std::cout << typeid(T).name() << '\n';
+	});
+}
+
+int main() {
+	tuple_fold();
+	tuple_type_fold();
+	tuple_for_each();
+	tuple_type_for_each();
+}