change const to constexpr

PiperOrigin-RevId: 307113877

db/skiplist_test.cc

@@ -151,7 +151,7 @@ TEST(SkipTest, InsertAndLookup) {
 // been concurrently added since the iterator started.
 class ConcurrentTest {
  private:
-  static const uint32_t K = 4;
+  static constexpr uint32_t K = 4;
 
   static uint64_t key(Key key) { return (key >> 40); }
   static uint64_t gen(Key key) { return (key >> 8) & 0xffffffffu; }
@@ -280,7 +280,6 @@ class ConcurrentTest {
     }
   }
 };
-const uint32_t ConcurrentTest::K;
 
 // Simple test that does single-threaded testing of the ConcurrentTest
 // scaffolding.

util/cache_test.cc

@@ -31,7 +31,7 @@ class CacheTest : public testing::Test {
     current_->deleted_values_.push_back(DecodeValue(v));
   }
 
-  static const int kCacheSize = 1000;
+  static constexpr int kCacheSize = 1000;
   std::vector<int> deleted_keys_;
   std::vector<int> deleted_values_;
   Cache* cache_;