odb dbStream: adding an error message to the template recursion limit

Signed-off-by: Felipe Garay <fgaray@google.com>
fgaray · Jan 5, 2024 · 5a1acf4 · 5a1acf4
1 parent 1ddb4c1
commit 5a1acf4
Showing 1 changed file with 4 additions and 4 deletions.
diff --git a/src/odb/include/odb/dbStream.h b/src/odb/include/odb/dbStream.h
@@ -176,7 +176,7 @@ class dbOStream
   template <size_t I = 0, typename... Ts>
   constexpr dbOStream& operator<<(const std::tuple<Ts...>& tup)
   {
-    static_assert(I < kTemplateRecursionLimit);
+    static_assert(I <= kTemplateRecursionLimit, "OpenROAD disallows of std::variants larger than 16 elements. You should look into alternate solutions");
     if constexpr (I == sizeof...(Ts)) {
       return *this;
     } else {
@@ -229,7 +229,7 @@ class dbOStream
   template <uint32_t I = 0, typename... Ts>
   dbOStream& operator<<(const std::variant<Ts...>& v)
   {
-    static_assert(I < kTemplateRecursionLimit);
+    static_assert(I <= kTemplateRecursionLimit, "OpenROAD disallows of std::variants larger than 16 elements. You should look into alternate solutions");
     if constexpr (I == sizeof...(Ts)) {
       return *this;
     } else {
@@ -400,7 +400,7 @@ class dbIStream
   template <size_t I = 0, typename... Ts>
   constexpr dbIStream& operator>>(std::tuple<Ts...>& tup)
   {
-    static_assert(I < kTemplateRecursionLimit);
+    static_assert(I <= kTemplateRecursionLimit, "OpenROAD disallows of std::variants larger than 16 elements. You should look into alternate solutions");
     if constexpr (I == sizeof...(Ts)) {
       return *this;
     } else {
@@ -434,7 +434,7 @@ class dbIStream
   template <uint32_t I = 0, typename... Ts>
   dbIStream& variantHelper(uint32_t index, std::variant<Ts...>& v)
   {
-    static_assert(I < kTemplateRecursionLimit);
+    static_assert(I <= kTemplateRecursionLimit, "OpenROAD disallows of std::variants larger than 16 elements. You should look into alternate solutions");
     if constexpr (I == sizeof...(Ts)) {
       return *this;
     } else {