Reserve vector capacity prior to calling `push_back()` in a loop.

PiperOrigin-RevId: 435111851
3 years ago · b0f55f0879
parent 027129bf0f
commit b0f55f0879
1 changed files with 1 additions and 0 deletions
--- a/upbc/protoc-gen-upb.cc
+++ b/upbc/protoc-gen-upb.cc
@ -120,6 +120,7 @@ std::vector<const protobuf::EnumDescriptor*> SortedEnums(
 std::vector<int32_t> SortedUniqueEnumNumbers(
    const protobuf::EnumDescriptor* e) {
  std::vector<int32_t> values;
+  values.reserve(e->value_count());
  for (int i = 0; i < e->value_count(); i++) {
    values.push_back(e->value(i)->number());
  }