1 files changed, 32 insertions, 0 deletions
diff --git a/src/random.hpp b/src/random.hpp
new file mode 100644
index 00000000..3616aabf
--- /dev/null
+++ b/src/random.hpp
@@ -0,0 +1,32 @@
+#pragma once
+#include <cstddef>
+#include <concepts>
+#include <type_traits>
+
+namespace floormat {
+
+struct random_engine
+{
+    virtual inline ~random_engine();
+    virtual std::common_type_t<std::size_t, std::uintptr_t, std::ptrdiff_t> operator()() = 0;
+
+    template<std::integral T>
+    requires (sizeof(T) <= sizeof(std::size_t))
+    T operator()(T max) {
+        return static_cast<T>(operator()() % static_cast<std::size_t>(max));
+    }
+
+    template<std::integral T>
+    requires (sizeof(T) <= sizeof(std::size_t))
+    T operator()(T min, T max) {
+        return min + operator()(max-min);
+    }
+
+    virtual float operator()(float min, float max) = 0;
+};
+
+random_engine::~random_engine() = default;
+
+[[maybe_unused]] extern random_engine& random; // NOLINT(cppcoreguidelines-avoid-non-const-global-variables)
+
+} // namespace floormat