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Fix handling of streamable and convertible to string types

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This commit is contained in:
Victor Zverovich 2019-11-25 16:46:33 -08:00
parent d19ed6716d
commit 0d07db1234
3 changed files with 25 additions and 15 deletions
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2
include/fmt/core.h
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@ -905,6 +905,8 @@ template <typename Context> struct arg_mapper {
}
template <typename T,
FMT_ENABLE_IF(!is_string<T>::value && !is_char<T>::value &&
!std::is_constructible<basic_string_view<char_type>,
T>::value &&
(has_formatter<T, Context>::value ||
has_fallback_formatter<T, Context>::value))>
FMT_CONSTEXPR const T& map(const T& val) {

13
test/core-test.cc
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@ -635,19 +635,6 @@ TEST(FormatterTest, FormatExplicitlyConvertibleToWStringView) {
EXPECT_EQ(L"foo",
fmt::format(L"{}", explicitly_convertible_to_wstring_view()));
}
struct explicitly_convertible_to_string_like {
template <typename String,
typename = typename std::enable_if<std::is_constructible<
String, const char*, std::size_t>::value>::type>
explicit operator String() const {
return String("foo", 3u);
}
};
TEST(FormatterTest, FormatExplicitlyConvertibleToStringLike) {
EXPECT_EQ("foo", fmt::format("{}", explicitly_convertible_to_string_like()));
}
#endif
struct disabled_rvalue_conversion {

25
test/ostream-test.cc
View File

@ -243,8 +243,7 @@ TEST(FormatTest, UDL) {
}
#endif
template <typename T>
struct convertible {
template <typename T> struct convertible {
T value;
explicit convertible(const T& val) : value(val) {}
operator T() const { return value; }
@ -255,3 +254,25 @@ TEST(OStreamTest, DisableBuiltinOStreamOperators) {
EXPECT_EQ(L"42", fmt::format(L"{:d}", convertible<unsigned short>(42)));
EXPECT_EQ("foo", fmt::format("{}", convertible<const char*>("foo")));
}
struct explicitly_convertible_to_string_like {
template <typename String,
typename = typename std::enable_if<std::is_constructible<
String, const char*, std::size_t>::value>::type>
explicit operator String() const {
return String("foo", 3u);
}
};
TEST(FormatterTest, FormatExplicitlyConvertibleToStringLike) {
EXPECT_EQ("foo", fmt::format("{}", explicitly_convertible_to_string_like()));
}
std::ostream& operator<<(std::ostream& os,
explicitly_convertible_to_string_like) {
return os << "bar";
}
TEST(FormatterTest, FormatExplicitlyConvertibleToStringLikeIgnoreInserter) {
EXPECT_EQ("foo", fmt::format("{}", explicitly_convertible_to_string_like()));
}