1 files changed, 37 insertions, 0 deletions
diff --git a/examples/value_modification.cpp b/examples/value_modification.cpp
new file mode 100644
index 0000000..2584efd
--- /dev/null
+++ b/examples/value_modification.cpp
@@ -0,0 +1,37 @@
+#include <frozen/set.h>
+#include <frozen/string.h>
+#include <frozen/unordered_map.h>
+#include <iostream>
+
+/// MAYBE_CONSTINIT expands to `constinit` if available.
+#if __cpp_constinit
+#define MAYBE_CONSTINIT constinit
+#else
+#define MAYBE_CONSTINIT
+#endif
+
+// To make a frozen::unordered_map where you can modify the values, make a
+// non-constexpr instance. If available, prefer to use constinit. It will
+// initialize the map during compilation and detect any exceptions.
+MAYBE_CONSTINIT static frozen::unordered_map<frozen::string, int, 2> fruits = {
+    {"n_apples", 0},
+    {"n_pears", 0},
+};
+
+int main() {
+  // Update the values using at()
+  fruits.at("n_apples") = 10;
+  fruits.at("n_pears") = fruits.at("n_apples") * 2;
+  std::cout << "n_apples: " << fruits.at("n_apples") << std::endl;
+  std::cout << "n_pears: " << fruits.at("n_pears") << std::endl;
+
+  // You can also update values via the iterator returned by find()
+  auto found = fruits.find("n_apples");
+  found->second = 0;
+  std::cout << "n_apples: " << fruits.at("n_apples") << std::endl;
+
+  // Range also works
+  auto range = fruits.equal_range("n_apples");
+  range.first->second = 1337;
+  std::cout << "n_apples: " << fruits.at("n_apples") << std::endl;
+}
+\ No newline at end of file