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Implicitly convert strings with to_format_string to a format_string #42

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Jan 15, 2024
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Implicitly convert strings with to_format_string to a format_string #42

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10 changes: 7 additions & 3 deletions include/nanofmt/format.inl
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Original file line number Diff line number Diff line change
Expand Up @@ -20,6 +20,10 @@ namespace NANOFMT_NS {
template <typename T>
struct value_type_map;

template <typename T>
using enable_if_format_string =
std::enable_if_t<std::is_same_v<::NANOFMT_NS::format_string, decltype(to_format_string(declval<T>()))>>;

struct char_buffer {
char const* chars = nullptr;
std::size_t max_length = 0;
Expand Down Expand Up @@ -113,8 +117,8 @@ namespace NANOFMT_NS {
constexpr /*implicit*/ format_string(char const (&str)[N]) noexcept;
constexpr explicit format_string(char const* const zstr) noexcept;

template <typename StringT>
constexpr explicit format_string(StringT const& string) noexcept;
template <typename StringT, typename = detail::enable_if_format_string<StringT>>
constexpr /*implicit*/ format_string(StringT const& string) noexcept;

char const* begin = nullptr;
char const* end = nullptr;
Expand Down Expand Up @@ -243,7 +247,7 @@ namespace NANOFMT_NS {
: begin(zstr)
, end(begin + __builtin_strlen(begin)) {}

template <typename StringT>
template <typename StringT, typename>
constexpr format_string::format_string(StringT const& string) noexcept : format_string(to_format_string(string)) {}

template <typename StringT>
Expand Down
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