serge-sans-paille#105 Add example

examples/CMakeLists.txt

@@ -1,4 +1,4 @@
-set(frozen.examples.srcs enum_to_string enum_to_string_hash pixel_art static_assert)
+set(frozen.examples.srcs enum_to_string enum_to_string_hash pixel_art static_assert value_modification)
 
 if ("${CMAKE_CXX_COMPILER_ID}" MATCHES ".*Clang")
     list(APPEND frozen.examples.srcs html_entities_map)

examples/value_modification.cpp

@@ -0,0 +1,28 @@
+#include <frozen/set.h>
+#include <frozen/string.h>
+#include <frozen/unordered_map.h>
+#include <iostream>
+
+
+int main() {
+  frozen::unordered_map<frozen::string, int, 2> fruits = {
+      {"n_apples", 0},
+      {"n_pears", 0},
+  };
+
+  std::cout << fruits.at("n_apples") << std::endl;
+  std::cout << fruits.at("n_pears") << std::endl;
+
+  fruits.at("n_apples") = 10;
+  fruits.at("n_pears") = fruits.at("n_apples") * 2;
+
+  std::cout << fruits.at("n_apples") << std::endl;
+  std::cout << fruits.at("n_pears") << std::endl;
+
+  auto found = fruits.find("n_oranges");
+  if (found == fruits.end()) {
+    std::cout << "no oranges, as expected" << std::endl;
+  }
+
+  auto range = fruits.equal_range("n_oranges");
+}