Add fp_t subtraction

1 files changed, 4 insertions, 0 deletions

diff --git a/src/fixed_point.cpp b/src/fixed_point.cpp
index 7ff77a0..9b2d8e2 100644
--- a/src/fixed_point.cpp
+++ b/src/fixed_point.cpp
@@ -4,6 +4,10 @@ fp_t fp_t::operator+(const fp_t& other) const {
     return {(int32_t)((uint32_t)raw + (uint32_t)other.raw)};
 }
 
+fp_t fp_t::operator-(const fp_t& other) const {
+    return {(int32_t)((uint32_t)raw - (uint32_t)other.raw)};
+}
+
 bool fp_t::operator==(const fp_t& other) const {
     return raw == other.raw;
 }