Add increment/decrement operators to Eigen::half.

This is for consistency with bfloat16, and to support initialization
with `std::iota`.

1 files changed, 14 insertions, 0 deletions

diff --git a/test/half_float.cpp b/test/half_float.cpp
index b2c22197f..1cfe69e93 100644
--- a/test/half_float.cpp
+++ b/test/half_float.cpp
@@ -168,6 +168,20 @@ void test_arithmetic()
   VERIFY_IS_APPROX(float(half(1.0f) / half(3.0f)), 0.33333f);
   VERIFY_IS_EQUAL(float(-half(4096.0f)), -4096.0f);
   VERIFY_IS_EQUAL(float(-half(-4096.0f)), 4096.0f);
+  
+  half x(3);
+  half y = ++x;
+  VERIFY_IS_EQUAL(x, half(4));
+  VERIFY_IS_EQUAL(y, half(4));
+  y = --x;
+  VERIFY_IS_EQUAL(x, half(3));
+  VERIFY_IS_EQUAL(y, half(3));
+  y = x++;
+  VERIFY_IS_EQUAL(x, half(4));
+  VERIFY_IS_EQUAL(y, half(3));
+  y = x--;
+  VERIFY_IS_EQUAL(x, half(3));
+  VERIFY_IS_EQUAL(y, half(4));
 }
 
 void test_comparison()