-

.github/workflows/CI_ubuntu.yaml

@@ -31,12 +31,12 @@ jobs:
           - type: Debug
             compiler: gcc
             cxx_compiler: g++
-            version: 11
-
+            version: 11 
+          
           - type: Debug
             compiler: gcc
             cxx_compiler: g++
-            version: 14     
+            version: 12 
 
     name: '${{matrix.type}} ${{matrix.compiler}}-${{matrix.version}}'
     runs-on: ubuntu-22.04 #bug in std library(https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115119)

include/tgbm/api/optional.hpp

@@ -291,10 +291,8 @@ struct optional<Integer> {
   using value_type = Integer;
 
  private:
-  static consteval Integer empty() {
-    return Integer(std::numeric_limits<int64_t>::max());
-  }
-  Integer _val = empty();
+  static constexpr Integer empty_ = std::numeric_limits<int64_t>::max(); 
+  Integer _val = empty_;
 
  public:
   constexpr optional() noexcept = default;
@@ -303,21 +301,21 @@ struct optional<Integer> {
   constexpr optional(std::nullopt_t) noexcept : optional() {
   }
   constexpr optional& operator=(std::nullopt_t) noexcept {
-    _val = empty();
+    _val = empty_;
     return *this;
   }
   constexpr optional& operator=(value_type b) noexcept {
     _val = b;
     return *this;
   }
   constexpr bool has_value() const noexcept {
-    return _val != empty();
+    return _val != empty_;
   }
   constexpr explicit operator bool() const noexcept {
     return has_value();
   }
   constexpr void reset() noexcept {
-    _val = empty();
+    _val = empty_;
   }
   constexpr value_type& emplace(value_type v = value_type{}) noexcept {
     return _val = v;