o i2c test

o Misc other stuff.

1 files changed, 26 insertions, 3 deletions

diff --git a/playground/include/playground.h b/playground/include/playground.h
index 168c5c5..3e1b4bc 100644
--- a/playground/include/playground.h
+++ b/playground/include/playground.h
@@ -13,11 +13,34 @@ int main();
 extern "C"
 void Default_Handler();
 
+#include <cstdint>
+#include <limits>
+#include <utility>
+
 // TODO: replace with std::extent<>; http://en.cppreference.com/w/cpp/types/extent
-template<typename T, size_t N>
+//template<typename T, std::size_t N>
+//static inline constexpr
+//std::size_t SizeOfArray(const T(&)[N]) {
+//    return N;
+//}
+
+/*
+namespace {
+    template<class T> struct identity { using type = T; };
+}
+template<typename R, typename T, std::size_t N>
+static inline constexpr
+typename identity<R>::type SizeOfArray(const T(&)[N]) {
+    static_assert(std::numeric_limits<R>::max() >= N, "N does not fit in R");
+    return static_cast<R>(N);
+}
+*/
+
+template<typename R = std::size_t, typename T, std::size_t N>
 static inline constexpr
-size_t SizeOfArray(const T(&)[N]) {
-    return N;
+R SizeOfArray(const T(&)[N]) {
+    static_assert(std::numeric_limits<R>::max() >= N, "N does not fit in R");
+    return static_cast<R>(N);
 }
 
 #endif