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Disable integral operator<< (#1316)

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This commit is contained in:
Victor Zverovich 2019-09-23 20:34:08 -07:00
parent 20fdb88a1c
commit ccc8f5db02
2 changed files with 7 additions and 2 deletions
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4
include/fmt/ostream.h
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@ -49,6 +49,10 @@ template <typename Char> struct test_stream : std::basic_ostream<Char> {
// Hide all operator<< from std::basic_ostream<Char>.
void_t<> operator<<(null<>);
void_t<> operator<<(const Char*);
template <typename T, FMT_ENABLE_IF(std::is_convertible<T, int>::value &&
!std::is_enum<T>::value)>
void_t<> operator<<(T);
};
// Checks if T has a user-defined operator<< (e.g. not a member of

5
test/ostream-test.cc
View File

@ -250,7 +250,8 @@ struct convertible {
operator T() const { return value; }
};
TEST(OStreamTest, ConvertibleToCString) {
EXPECT_EQ("x", fmt::format("{}", convertible<char>('x')));
TEST(OStreamTest, DisableBuiltinOStreamOperators) {
EXPECT_EQ("42", fmt::format("{:d}", convertible<unsigned short>(42)));
EXPECT_EQ(L"42", fmt::format(L"{:d}", convertible<unsigned short>(42)));
EXPECT_EQ("foo", fmt::format("{}", convertible<const char*>("foo")));
}