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Fix issue 9482: False positive: Reference to temporary returned using trailing return type (#2413)

This commit is contained in:
Paul Fultz II 2019-12-01 08:10:02 -06:00 committed by Daniel Marjamäki
parent 2bdb7dc236
commit 9cb39b1d7e
2 changed files with 13 additions and 0 deletions
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3
lib/symboldatabase.cpp
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@ -2279,6 +2279,9 @@ bool Function::returnsReference(const Function* function, bool unknown)
start = start->next();
if (start->tokAt(1) == defEnd && !start->type() && !start->isStandardType())
return unknown;
// TODO: Try to deduce the type of the expression
if (Token::Match(start, "decltype|typeof"))
return unknown;
return false;
}

10
test/testautovariables.cpp
View File

@ -112,6 +112,7 @@ private:
TEST_CASE(returnReference16); // #9433
TEST_CASE(returnReference16); // #9433
TEST_CASE(returnReference17); // #9461
TEST_CASE(returnReference18); // #9482
TEST_CASE(returnReferenceFunction);
TEST_CASE(returnReferenceContainer);
TEST_CASE(returnReferenceLiteral);
@ -1297,6 +1298,15 @@ private:
ASSERT_EQUALS("", errout.str());
}
void returnReference18() {
check("template<class T>\n"
"auto f(T& x) -> decltype(x);\n"
"int& g(int* x) {\n"
" return f(*x);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void returnReferenceFunction() {
check("int& f(int& a) {\n"
" return a;\n"