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Make formatter<T> override ostream<< for templates (#952)

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This commit is contained in:
Victor Zverovich
2019-01-21 07:11:49 -08:00
parent 1b11b000c7
commit 5f1ceebc7f
5 changed files with 87 additions and 36 deletions
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24
test/ostream-test.cc
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@@ -178,6 +178,29 @@ template <typename Output> Output& operator<<(Output& out, ABC) {
}
} // namespace fmt_test
template <typename T>
struct TestTemplate {};
template <typename T>
std::ostream& operator<<(std::ostream& os, TestTemplate<T>) {
return os << 1;
}
namespace fmt {
template <typename T>
struct formatter<TestTemplate<T>> : formatter<int> {
template <typename FormatContext>
typename FormatContext::iterator format(TestTemplate<T>, FormatContext& ctx) {
return formatter<int>::format(2, ctx);
}
};
}
#if !FMT_GCC_VERSION || FMT_GCC_VERSION >= 407
TEST(OStreamTest, Template) {
EXPECT_EQ("2", fmt::format("{}", TestTemplate<int>()));
}
TEST(FormatTest, FormatToN) {
char buffer[4];
buffer[3] = 'x';
@@ -190,6 +213,7 @@ TEST(FormatTest, FormatToN) {
EXPECT_EQ(buffer + 3, result.out);
EXPECT_EQ("xABx", fmt::string_view(buffer, 4));
}
#endif
#if FMT_USE_USER_DEFINED_LITERALS
TEST(FormatTest, UDL) {