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Report error on duplicate named arg names (#4367)

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This commit is contained in:
Dean Glazeski
2025-03-02 08:47:03 -07:00
committed by GitHub
parent b776cf66fc
commit 864bdf9638
2 changed files with 18 additions and 0 deletions
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16
include/fmt/base.h
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@@ -1064,13 +1064,28 @@ template <typename Char> struct named_arg_info {
int id;
};
template <typename Char>
FMT_CONSTEXPR void check_for_duplicate(named_arg_info<Char>* named_args,
int named_arg_index,
basic_string_view<Char> arg_name) {
if (named_arg_index <= 0) return;
for (auto i = 0; i < named_arg_index; ++i) {
if (basic_string_view<Char>(named_args[i].name) == arg_name) {
report_error("duplicate named args found");
}
}
}
template <typename Char, typename T, FMT_ENABLE_IF(!is_named_arg<T>::value)>
void init_named_arg(named_arg_info<Char>*, int& arg_index, int&, const T&) {
++arg_index;
}
template <typename Char, typename T, FMT_ENABLE_IF(is_named_arg<T>::value)>
void init_named_arg(named_arg_info<Char>* named_args, int& arg_index,
int& named_arg_index, const T& arg) {
check_for_duplicate<Char>(named_args, named_arg_index, arg.name);
named_args[named_arg_index++] = {arg.name, arg_index++};
}
@@ -1084,6 +1099,7 @@ template <typename T, typename Char,
FMT_ENABLE_IF(is_static_named_arg<T>::value)>
FMT_CONSTEXPR void init_static_named_arg(named_arg_info<Char>* named_args,
int& arg_index, int& named_arg_index) {
check_for_duplicate<Char>(named_args, named_arg_index, T::name);
named_args[named_arg_index++] = {T::name, arg_index++};
}

2
test/format-test.cc
View File

@@ -599,6 +599,8 @@ TEST(format_test, named_arg) {
EXPECT_THROW_MSG((void)fmt::format(runtime("{a} {}"), fmt::arg("a", 2), 42),
format_error,
"cannot switch from manual to automatic argument indexing");
EXPECT_THROW_MSG((void)fmt::format("{a}", fmt::arg("a", 1),
fmt::arg("a", 10)), format_error, "duplicate named args found");
}
TEST(format_test, auto_arg_index) {