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Make formatter specializations override implicit conversions

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This commit is contained in:
Victor Zverovich 2019-06-07 06:25:46 -07:00
parent 3fdba04924
commit b3cf8613b1
2 changed files with 29 additions and 2 deletions
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12
include/fmt/core.h
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@ -853,8 +853,8 @@ void make_value(const T*) {
}
template <typename C, typename T,
FMT_ENABLE_IF(convert_to_int<T, typename C::char_type>::value&&
std::is_enum<T>::value)>
FMT_ENABLE_IF(std::is_enum<T>::value&&
convert_to_int<T, typename C::char_type>::value)>
inline init<C, int, int_type> make_value(const T& val) {
return static_cast<int>(val);
}
@ -873,6 +873,14 @@ inline init<C, const T&, custom_type> make_value(const T& val) {
return val;
}
template <typename C, typename T,
FMT_ENABLE_IF(std::is_class<T>::value&& std::is_convertible<
T, int>::value&& is_formattable<T, C>::value &&
!std::is_same<T, typename C::char_type>::value)>
inline init<C, const T&, custom_type> make_value(const T& val) {
return val;
}
template <typename C, typename T>
init<C, const void*, named_arg_type> make_value(
const named_arg<T, typename C::char_type>& val) {

19
test/core-test.cc
View File

@ -442,6 +442,25 @@ TEST(CoreTest, ConvertToInt) {
EXPECT_TRUE((fmt::convert_to_int<enum_with_underlying_type, char>::value));
}
struct convertible_to_int {
operator int() const { return 42; }
};
FMT_BEGIN_NAMESPACE
template <> struct formatter<convertible_to_int> {
auto parse(format_parse_context& ctx) -> decltype(ctx.begin()) {
return ctx.begin();
}
auto format(convertible_to_int, format_context& ctx) -> decltype(ctx.out()) {
return std::copy_n("foo", 3, ctx.out());
}
};
FMT_END_NAMESPACE
TEST(CoreTest, FormatterOverridesImplicitConversion) {
EXPECT_EQ(fmt::format("{}", convertible_to_int()), "foo");
}
namespace my_ns {
template <typename Char> class my_string {
public: