etc: Put reminders for changing pretty printers in CPP classes.

libopenage/coord/coord.h.template

@@ -1,4 +1,4 @@
-// Copyright 2016-2023 the openage authors. See copying.md for legal info.
+// Copyright 2016-2024 the openage authors. See copying.md for legal info.
 
 #pragma once
 
@@ -24,6 +24,9 @@ namespace coord {
  *
  * 'Absolute' and 'Relative' are the absolute and relative types of the
  * derived class (CRTP).
+ *
+ * If you change this class, remember to update the gdb pretty printers
+ * in etc/gdb_pretty/printers.py.
  */
 template<typename CoordType, typename Absolute, typename Relative>
 struct Coord${camelcase}Absolute {
@@ -87,6 +90,9 @@ struct Coord${camelcase}Absolute {
  *
  * 'Absolute' and 'Relative' are the absolute and relative types of the
  * derived class (CRTP).
+ *
+ * If you change this class, remember to update the gdb pretty printers
+ * in etc/gdb_pretty/printers.py.
  */
 template<typename CoordType, typename Absolute, typename Relative>
 struct Coord${camelcase}Relative {

libopenage/curve/keyframe.h

@@ -11,6 +11,9 @@ namespace openage::curve {
 /**
  * A element of the curvecontainer. This is especially used to keep track of
  * the value-timing.
+ *
+ * If you change this class, remember to update the gdb pretty printers
+ * in etc/gdb_pretty/printers.py.
  */
 template <typename T>
 class Keyframe {

libopenage/util/fixed_point.h

@@ -81,6 +81,9 @@ constexpr static
  * For example,
  * FixedPoint<int64_t, 32>
  * can store values from -2**32 to +2**32 with a constant precision of 2**-32.
+ *
+ * If you change this class, remember to update the gdb pretty printers
+ * in etc/gdb_pretty/printers.py.
  */
 template <typename int_type, unsigned int fractional_bits>
 class FixedPoint {

libopenage/util/vector.h

@@ -20,6 +20,9 @@ namespace openage::util {
  *
  * N = dimensions
  * T = underlying single value type (double, float, ...)
+ *
+ * If you change this class, remember to update the gdb pretty printers
+ * in etc/gdb_pretty/printers.py.
  */
 template <size_t N, typename T>
 class Vector : public std::array<T, N> {