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Make advance_to a noop for back_insert_iterator

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This commit is contained in:
Victor Zverovich 2020-06-06 19:36:20 -07:00
parent 50bad7d62d
commit 57ddc77ce7
1 changed files with 23 additions and 15 deletions
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38
include/fmt/core.h
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@ -1202,7 +1202,27 @@ FMT_CONSTEXPR_DECL FMT_INLINE auto visit_format_arg(
return vis(monostate());
}
// Checks whether T is a container with contiguous storage.
template <typename T> struct is_contiguous : std::false_type {};
template <typename Char>
struct is_contiguous<std::basic_string<Char>> : std::true_type {};
template <typename Char>
struct is_contiguous<detail::buffer<Char>> : std::true_type {};
namespace detail {
template <typename OutputIt>
struct is_back_insert_iterator : std::false_type {};
template <typename Container>
struct is_back_insert_iterator<std::back_insert_iterator<Container>>
: std::true_type {};
template <typename OutputIt>
struct is_contiguous_back_insert_iterator : std::false_type {};
template <typename Container>
struct is_contiguous_back_insert_iterator<std::back_insert_iterator<Container>>
: is_contiguous<Container> {};
// A type-erased reference to an std::locale to avoid heavy <locale> include.
class locale_ref {
private:
@ -1329,7 +1349,9 @@ template <typename OutputIt, typename Char> class basic_format_context {
iterator out() { return out_; }
// Advances the begin iterator to ``it``.
void advance_to(iterator it) { out_ = it; }
void advance_to(iterator it) {
if (!detail::is_back_insert_iterator<iterator>()) out_ = it;
}
detail::locale_ref locale() { return loc_; }
};
@ -1715,22 +1737,8 @@ struct wformat_args : basic_format_args<wformat_context> {
using basic_format_args::basic_format_args;
};
template <typename Container> struct is_contiguous : std::false_type {};
template <typename Char>
struct is_contiguous<std::basic_string<Char>> : std::true_type {};
template <typename Char>
struct is_contiguous<detail::buffer<Char>> : std::true_type {};
namespace detail {
template <typename OutputIt>
struct is_contiguous_back_insert_iterator : std::false_type {};
template <typename Container>
struct is_contiguous_back_insert_iterator<std::back_insert_iterator<Container>>
: is_contiguous<Container> {};
// Reports a compile-time error if S is not a valid format string.
template <typename..., typename S, FMT_ENABLE_IF(!is_compile_string<S>::value)>
FMT_INLINE void check_format_string(const S&) {