Gerrit0 commented on code in PR #2931:
URL: https://github.com/apache/avro/pull/2931#discussion_r1622600509
##########
lang/c++/impl/Compiler.cc:
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@@ -286,8 +286,9 @@ static Field makeField(const Entity &e, SymbolTable &st,
const string &ns) {
const Object &m = e.objectValue();
string n = getStringField(e, m, "name");
vector<string> aliases;
- if (containsField(m, "aliases")) {
- for (const auto &alias : getArrayField(e, m, "aliases")) {
+ string aliasesName = "aliases";
+ if (containsField(m, aliasesName)) {
+ for (const auto &alias : getArrayField(e, m, aliasesName)) {
Review Comment:
I'll admit this is kind of a weird change... the compiler appears to think
that the lifetime of the name passed to `getArrayField` may be linked to the
lifetime of the returned reference. It doesn't appear to be from my
investigation, but this happens to slightly improve performance wherever we use
`containsField` + `getArrayField` together anyways, so seems a minor cost to
pay.
```text
/home/gerrit/Desktop/avro/lang/c++/impl/Compiler.cc: In function
‘avro::Field avro::makeField(const json::Entity&, SymbolTable&, const
std::string&)’:
/home/gerrit/Desktop/avro/lang/c++/impl/Compiler.cc:290:63: error: possibly
dangling reference to a temporary [-Werror=dangling-reference]
290 | for (const auto &alias : getArrayField(e, m, "aliases")) {
| ^
/home/gerrit/Desktop/avro/lang/c++/impl/Compiler.cc:290:47: note: the
temporary was destroyed at the end of the full expression
‘avro::getArrayField((* & e), (* & m), std::__cxx11::basic_string<char>(((const
char*)"aliases"), std::allocator<char>()))’
290 | for (const auto &alias : getArrayField(e, m, "aliases")) {
| ~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~
```
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