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Cleanup ranges API

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This commit is contained in:
Victor Zverovich
2021-06-02 17:06:02 -07:00
parent aa09e0f5dd
commit 290d3f8b61
2 changed files with 45 additions and 39 deletions
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68
include/fmt/ranges.h
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@@ -19,15 +19,7 @@
FMT_BEGIN_NAMESPACE
template <typename Char> struct formatting_base {
template <typename ParseContext>
FMT_CONSTEXPR auto parse(ParseContext& ctx) -> decltype(ctx.begin()) {
return ctx.begin();
}
};
template <typename Char, typename Enable = void>
struct formatting_range : formatting_base<Char> {
template <typename Char, typename Enable = void> struct formatting_range {
#ifdef FMT_DEPRECATED_BRACED_RANGES
Char prefix = '{';
Char postfix = '}';
@@ -35,12 +27,21 @@ struct formatting_range : formatting_base<Char> {
Char prefix = '[';
Char postfix = ']';
#endif
template <typename ParseContext>
FMT_CONSTEXPR auto parse(ParseContext& ctx) -> decltype(ctx.begin()) {
return ctx.begin();
}
};
template <typename Char, typename Enable = void>
struct formatting_tuple : formatting_base<Char> {
template <typename Char, typename Enable = void> struct formatting_tuple {
Char prefix = '(';
Char postfix = ')';
template <typename ParseContext>
FMT_CONSTEXPR auto parse(ParseContext& ctx) -> decltype(ctx.begin()) {
return ctx.begin();
}
};
namespace detail {
@@ -362,50 +363,52 @@ struct formatter<
}
};
template <typename Char, typename... T> struct tuple_arg_join : detail::view {
template <typename Char, typename... T> struct tuple_join_view : detail::view {
const std::tuple<T...>& tuple;
basic_string_view<Char> sep;
tuple_arg_join(const std::tuple<T...>& t, basic_string_view<Char> s)
tuple_join_view(const std::tuple<T...>& t, basic_string_view<Char> s)
: tuple(t), sep{s} {}
};
template <typename Char, typename... T>
struct formatter<tuple_arg_join<Char, T...>, Char> {
using tuple_arg_join = tuple_join_view<Char, T...>;
template <typename Char, typename... T>
struct formatter<tuple_join_view<Char, T...>, Char> {
template <typename ParseContext>
FMT_CONSTEXPR auto parse(ParseContext& ctx) -> decltype(ctx.begin()) {
return ctx.begin();
}
template <typename FormatContext>
typename FormatContext::iterator format(
const tuple_arg_join<Char, T...>& value, FormatContext& ctx) {
auto format(const tuple_join_view<Char, T...>& value, FormatContext& ctx) ->
typename FormatContext::iterator {
return format(value, ctx, detail::make_index_sequence<sizeof...(T)>{});
}
private:
template <typename FormatContext, size_t... N>
typename FormatContext::iterator format(
const tuple_arg_join<Char, T...>& value, FormatContext& ctx,
detail::index_sequence<N...>) {
auto format(const tuple_join_view<Char, T...>& value, FormatContext& ctx,
detail::index_sequence<N...>) ->
typename FormatContext::iterator {
return format_args(value, ctx, std::get<N>(value.tuple)...);
}
template <typename FormatContext>
typename FormatContext::iterator format_args(
const tuple_arg_join<Char, T...>&, FormatContext& ctx) {
auto format_args(const tuple_join_view<Char, T...>&, FormatContext& ctx) ->
typename FormatContext::iterator {
// NOTE: for compilers that support C++17, this empty function instantiation
// can be replaced with a constexpr branch in the variadic overload.
return ctx.out();
}
template <typename FormatContext, typename Arg, typename... Args>
typename FormatContext::iterator format_args(
const tuple_arg_join<Char, T...>& value, FormatContext& ctx,
const Arg& arg, const Args&... args) {
auto format_args(const tuple_join_view<Char, T...>& value, FormatContext& ctx,
const Arg& arg, const Args&... args) ->
typename FormatContext::iterator {
using base = formatter<typename std::decay<Arg>::type, Char>;
auto out = ctx.out();
out = base{}.format(arg, ctx);
auto out = base().format(arg, ctx);
if (sizeof...(Args) > 0) {
out = std::copy(value.sep.begin(), value.sep.end(), out);
ctx.advance_to(out);
@@ -429,14 +432,15 @@ FMT_MODULE_EXPORT_BEGIN
\endrst
*/
template <typename... T>
FMT_CONSTEXPR tuple_arg_join<char, T...> join(const std::tuple<T...>& tuple,
string_view sep) {
FMT_CONSTEXPR auto join(const std::tuple<T...>& tuple, string_view sep)
-> tuple_join_view<char, T...> {
return {tuple, sep};
}
template <typename... T>
FMT_CONSTEXPR tuple_arg_join<wchar_t, T...> join(
const std::tuple<T...>& tuple, basic_string_view<wchar_t> sep) {
FMT_CONSTEXPR auto join(const std::tuple<T...>& tuple,
basic_string_view<wchar_t> sep)
-> tuple_join_view<wchar_t, T...> {
return {tuple, sep};
}
@@ -452,8 +456,8 @@ FMT_CONSTEXPR tuple_arg_join<wchar_t, T...> join(
\endrst
*/
template <typename T>
join_view<const T*, const T*> join(std::initializer_list<T> list,
string_view sep) {
auto join(std::initializer_list<T> list, string_view sep)
-> join_view<const T*, const T*> {
return join(std::begin(list), std::end(list), sep);
}