constexpr_clamp

[folly.git] / folly / test / ConstexprMathTest.cpp

diff --git a/folly/test/ConstexprMathTest.cpp b/folly/test/ConstexprMathTest.cpp
index 6c0c71f9c9a2f277b22dcc6a6853b81cf6684c00..1d732b7ac9078263386935256615d3035c127bae 100644 (file)
--- a/folly/test/ConstexprMathTest.cpp
+++ b/folly/test/ConstexprMathTest.cpp
@@ -41,6 +41,18 @@ TEST_F(ConstexprMathTest, constexpr_max) {
   EXPECT_TRUE((std::is_same<const uint16_t, decltype(a)>::value));
 }
 
+TEST_F(ConstexprMathTest, constexpr_clamp) {
+  constexpr auto lo = uint16_t(3);
+  constexpr auto hi = uint16_t(7);
+  constexpr auto x = folly::constexpr_clamp(uint16_t(2), lo, hi);
+  constexpr auto y = folly::constexpr_clamp(uint16_t(5), lo, hi);
+  constexpr auto z = folly::constexpr_clamp(uint16_t(8), lo, hi);
+  EXPECT_EQ(3, x);
+  EXPECT_EQ(5, y);
+  EXPECT_EQ(7, z);
+  EXPECT_TRUE((std::is_same<const uint16_t, decltype(y)>::value));
+}
+
 TEST_F(ConstexprMathTest, constexpr_abs_unsigned) {
   constexpr auto v = uint32_t(17);
   constexpr auto a = folly::constexpr_abs(v);