constexpr_log2

[folly.git] / folly / portability / test / ConstexprTest.cpp

diff --git a/folly/portability/test/ConstexprTest.cpp b/folly/portability/test/ConstexprTest.cpp
index bb4b8beeeb5108ec37999220ba97660d7d65a3df..d2f6dbe3a17390865d773b2b7535fd330a02dcb3 100644 (file)
--- a/folly/portability/test/ConstexprTest.cpp
+++ b/folly/portability/test/ConstexprTest.cpp
@@ -71,3 +71,24 @@ TEST_F(ConstexprTest, constexpr_abs_double_negative) {
   EXPECT_EQ(17.5, a);
   EXPECT_TRUE((std::is_same<const double, decltype(a)>::value));
 }
+
+TEST_F(ConstexprTest, constexpr_log2_1) {
+  constexpr auto v = 1ull;
+  constexpr auto a = folly::constexpr_log2(v);
+  EXPECT_EQ(0ull, a);
+  EXPECT_TRUE((std::is_same<decltype(v), decltype(a)>::value));
+}
+
+TEST_F(ConstexprTest, constexpr_log2_2) {
+  constexpr auto v = 2ull;
+  constexpr auto a = folly::constexpr_log2(v);
+  EXPECT_EQ(1ull, a);
+  EXPECT_TRUE((std::is_same<decltype(v), decltype(a)>::value));
+}
+
+TEST_F(ConstexprTest, constexpr_log2_64) {
+  constexpr auto v = 64ull;
+  constexpr auto a = folly::constexpr_log2(v);
+  EXPECT_EQ(6ull, a);
+  EXPECT_TRUE((std::is_same<decltype(v), decltype(a)>::value));
+}