Implemented `tav::If` as `std::conditional` wrapper

2 files changed, 27 insertions, 0 deletions

diff --git a/src/conditional/if.h b/src/conditional/if.h
new file mode 100644
index 0000000..29aa6f0
--- /dev/null
+++ b/src/conditional/if.h
@@ -0,0 +1,21 @@
+#ifndef TYPEASVALUE_SRC_CONDITIONAL_IF_H_
+#define TYPEASVALUE_SRC_CONDITIONAL_IF_H_
+
+#include <type_traits>
+
+namespace tav {
+
+template <
+	bool     Condition,
+	typename IfBranch,
+	typename ElseBranch
+>
+using If = typename std::conditional<
+	Condition,
+	IfBranch,
+	ElseBranch
+>::type;
+
+}
+
+#endif  // TYPEASVALUE_SRC_CONDITIONAL_IF_H_
diff --git a/test.cc b/test.cc
index 219bfe5..4e97b7a 100644
--- a/test.cc
+++ b/test.cc
@@ -2,6 +2,7 @@
 
 #include "type.h"
 #include "operation/math.h"
+#include "conditional/if.h"
 
 class TypeAsValueTest : public ::testing::Test { };
 
@@ -16,6 +17,11 @@ TEST_F(TypeAsValueTest, BasicMath) {
 	EXPECT_EQ(5,  ( tav::divide<tav::Int<10>, tav::Int<2>>::value ));
 }
 
+TEST_F(TypeAsValueTest, Conditional) {
+	EXPECT_EQ(1, ( tav::If<true,  tav::Int<1>, tav::Int<2>>::value ));
+	EXPECT_EQ(2, ( tav::If<false, tav::Int<1>, tav::Int<2>>::value ));
+}
+
 int main(int argc, char **argv) {
 	testing::InitGoogleTest(&argc, argv);