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Workaround pathological conversion (#2343)

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This commit is contained in:
Victor Zverovich 2021-06-06 06:51:37 -07:00
parent 76ee490468
commit 206000a017
2 changed files with 22 additions and 1 deletions
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2
include/fmt/core.h
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@ -1539,7 +1539,7 @@ FMT_CONSTEXPR FMT_INLINE auto make_arg(const T& val) -> value<Context> {
!std::is_same<decltype(arg), const unformattable&>::value, !std::is_same<decltype(arg), const unformattable&>::value,
"Cannot format an argument. To make type T formattable provide a " "Cannot format an argument. To make type T formattable provide a "
"formatter<T> specialization: https://fmt.dev/latest/api.html#udt"); "formatter<T> specialization: https://fmt.dev/latest/api.html#udt");
return arg; return {arg};
} }
template <bool IS_PACKED, typename Context, type, typename T, template <bool IS_PACKED, typename Context, type, typename T,

21
test/format-test.cc
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@ -1436,6 +1436,27 @@ TEST(format_test, format_explicitly_convertible_to_std_string_view) {
} }
#endif #endif
struct converible_to_anything {
template <typename T> operator T() const { return T(); }
};
FMT_BEGIN_NAMESPACE
template <> struct formatter<converible_to_anything> {
FMT_CONSTEXPR auto parse(format_parse_context& ctx) -> decltype(ctx.begin()) {
return ctx.begin();
}
auto format(converible_to_anything, format_context& ctx)
-> decltype(ctx.out()) {
return format_to(ctx.out(), "foo");
}
};
FMT_END_NAMESPACE
TEST(format_test, format_convertible_to_anything) {
EXPECT_EQ("foo", fmt::format("{}", converible_to_anything()));
}
class Answer {}; class Answer {};
FMT_BEGIN_NAMESPACE FMT_BEGIN_NAMESPACE