AuroraMiddleware/fmt
1
0
Fork 0
mirror of https://github.com/fmtlib/fmt.git synced 2024-11-09 21:00:06 +00:00
Code Issues Packages Projects Releases Wiki Activity

Cleanup base API

Browse Source
This commit is contained in:
Victor Zverovich 2024-09-02 09:32:10 -07:00
parent 8803768363
commit 9a2aae37d4
1 changed files with 274 additions and 292 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

566
include/fmt/base.h
View File

@ -439,6 +439,11 @@ FMT_CONSTEXPR auto to_unsigned(Int value) -> make_unsigned_t<Int> {
return static_cast<make_unsigned_t<Int>>(value); return static_cast<make_unsigned_t<Int>>(value);
} }
template <typename Char>
using unsigned_char = typename conditional_t<std::is_integral<Char>::value,
std::make_unsigned<Char>,
type_identity<unsigned>>::type;
// A heuristic to detect std::string and std::[experimental::]string_view. // A heuristic to detect std::string and std::[experimental::]string_view.
// It is mainly used to avoid dependency on <[experimental/]string_view>. // It is mainly used to avoid dependency on <[experimental/]string_view>.
template <typename T, typename Enable = void> template <typename T, typename Enable = void>
@ -500,17 +505,14 @@ template <typename OutputIt>
inline FMT_CONSTEXPR20 auto get_container(OutputIt it) -> inline FMT_CONSTEXPR20 auto get_container(OutputIt it) ->
typename OutputIt::container_type& { typename OutputIt::container_type& {
struct accessor : OutputIt { struct accessor : OutputIt {
accessor(OutputIt base) : OutputIt(base) {} FMT_CONSTEXPR20 accessor(OutputIt base) : OutputIt(base) {}
using OutputIt::container; using OutputIt::container;
}; };
return *accessor(it).container; return *accessor(it).container;
} }
} // namespace detail } // namespace detail
FMT_BEGIN_EXPORT FMT_BEGIN_EXPORT // Parsing-related public API and forward declarations.
// Checks whether T is a container with contiguous storage.
template <typename T> struct is_contiguous : std::false_type {};
/** /**
* An implementation of `std::basic_string_view` for pre-C++17. It provides a * An implementation of `std::basic_string_view` for pre-C++17. It provides a
@ -621,10 +623,16 @@ template <> struct is_char<char> : std::true_type {};
template <typename T> class basic_appender; template <typename T> class basic_appender;
using appender = basic_appender<char>; using appender = basic_appender<char>;
// Checks whether T is a container with contiguous storage.
template <typename T> struct is_contiguous : std::false_type {};
class context; class context;
template <typename OutputIt, typename Char> class generic_context; template <typename OutputIt, typename Char> class generic_context;
template <typename Char> class parse_context;
// Longer aliases for C++20 compatibility. // Longer aliases for C++20 compatibility.
template <typename Char> using basic_format_parse_context = parse_context<Char>;
using format_parse_context = parse_context<char>;
template <typename OutputIt, typename Char> template <typename OutputIt, typename Char>
using basic_format_context = using basic_format_context =
conditional_t<std::is_same<OutputIt, appender>::value, context, conditional_t<std::is_same<OutputIt, appender>::value, context,
@ -659,6 +667,252 @@ inline auto format_as(T b) -> unsigned char {
} }
#endif #endif
/// Reports a format error at compile time or, via a `format_error` exception,
/// at runtime.
// This function is intentionally not constexpr to give a compile-time error.
FMT_NORETURN FMT_API void report_error(const char* message);
enum class presentation_type : unsigned char {
// Common specifiers:
none = 0,
debug = 1, // '?'
string = 2, // 's' (string, bool)
// Integral, bool and character specifiers:
dec = 3, // 'd'
hex, // 'x' or 'X'
oct, // 'o'
bin, // 'b' or 'B'
chr, // 'c'
// String and pointer specifiers:
pointer = 3, // 'p'
// Floating-point specifiers:
exp = 1, // 'e' or 'E' (1 since there is no FP debug presentation)
fixed, // 'f' or 'F'
general, // 'g' or 'G'
hexfloat // 'a' or 'A'
};
enum class align { none, left, right, center, numeric };
enum class sign { none, minus, plus, space };
enum class arg_id_kind { none, index, name };
// Basic format specifiers for built-in and string types.
class basic_specs {
private:
// Data is arranged as follows:
//
// 0 1 2 3
// 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
// |type |align| w | p | s |u|#|L| f | unused |
// +-----+-----+---+---+---+-+-+-+-----+---------------------------+
//
// w - dynamic width info
// p - dynamic precision info
// s - sign
// u - uppercase (e.g. 'X' for 'x')
// # - alternate form ('#')
// L - localized
// f - fill size
//
// Bitfields are not used because of compiler bugs such as gcc bug 61414.
enum : unsigned {
type_mask = 0x00007,
align_mask = 0x00038,
width_mask = 0x000C0,
precision_mask = 0x00300,
sign_mask = 0x00C00,
uppercase_mask = 0x01000,
alternate_mask = 0x02000,
localized_mask = 0x04000,
fill_size_mask = 0x38000,
align_shift = 3,
width_shift = 6,
precision_shift = 8,
sign_shift = 10,
fill_size_shift = 15,
max_fill_size = 4
};
unsigned long data_ = 1 << fill_size_shift;
// Character (code unit) type is erased to prevent template bloat.
char fill_data_[max_fill_size] = {' '};
FMT_CONSTEXPR void set_fill_size(size_t size) {
data_ = (data_ & ~fill_size_mask) | (size << fill_size_shift);
}
public:
constexpr auto type() const -> presentation_type {
return static_cast<presentation_type>(data_ & type_mask);
}
FMT_CONSTEXPR void set_type(presentation_type t) {
data_ = (data_ & ~type_mask) | static_cast<unsigned>(t);
}
constexpr auto align() const -> align {
return static_cast<fmt::align>((data_ & align_mask) >> align_shift);
}
FMT_CONSTEXPR void set_align(fmt::align a) {
data_ = (data_ & ~align_mask) | (static_cast<unsigned>(a) << align_shift);
}
constexpr auto dynamic_width() const -> arg_id_kind {
return static_cast<arg_id_kind>((data_ & width_mask) >> width_shift);
}
FMT_CONSTEXPR void set_dynamic_width(arg_id_kind w) {
data_ = (data_ & ~width_mask) | (static_cast<unsigned>(w) << width_shift);
}
FMT_CONSTEXPR auto dynamic_precision() const -> arg_id_kind {
return static_cast<arg_id_kind>((data_ & precision_mask) >>
precision_shift);
}
FMT_CONSTEXPR void set_dynamic_precision(arg_id_kind p) {
data_ = (data_ & ~precision_mask) |
(static_cast<unsigned>(p) << precision_shift);
}
constexpr bool dynamic() const {
return (data_ & (width_mask | precision_mask)) != 0;
}
constexpr auto sign() const -> sign {
return static_cast<fmt::sign>((data_ & sign_mask) >> sign_shift);
}
FMT_CONSTEXPR void set_sign(fmt::sign s) {
data_ = (data_ & ~sign_mask) | (static_cast<unsigned>(s) << sign_shift);
}
constexpr auto upper() const -> bool { return (data_ & uppercase_mask) != 0; }
FMT_CONSTEXPR void set_upper() { data_ |= uppercase_mask; }
constexpr auto alt() const -> bool { return (data_ & alternate_mask) != 0; }
FMT_CONSTEXPR void set_alt() { data_ |= alternate_mask; }
FMT_CONSTEXPR void clear_alt() { data_ &= ~alternate_mask; }
constexpr auto localized() const -> bool {
return (data_ & localized_mask) != 0;
}
FMT_CONSTEXPR void set_localized() { data_ |= localized_mask; }
constexpr auto fill_size() const -> size_t {
return (data_ & fill_size_mask) >> fill_size_shift;
}
template <typename Char, FMT_ENABLE_IF(std::is_same<Char, char>::value)>
constexpr auto fill() const -> const Char* {
return fill_data_;
}
template <typename Char, FMT_ENABLE_IF(!std::is_same<Char, char>::value)>
constexpr auto fill() const -> const Char* {
return nullptr;
}
template <typename Char> constexpr auto fill_unit() const -> Char {
using uchar = unsigned char;
return static_cast<Char>(static_cast<uchar>(fill_data_[0]) |
(static_cast<uchar>(fill_data_[1]) << 8));
}
FMT_CONSTEXPR void set_fill(char c) {
fill_data_[0] = c;
set_fill_size(1);
}
template <typename Char>
FMT_CONSTEXPR void set_fill(basic_string_view<Char> s) {
auto size = s.size();
set_fill_size(size);
if (size == 1) {
unsigned uchar = static_cast<detail::unsigned_char<Char>>(s[0]);
fill_data_[0] = static_cast<char>(uchar);
fill_data_[1] = static_cast<char>(uchar >> 8);
return;
}
FMT_ASSERT(size <= max_fill_size, "invalid fill");
for (size_t i = 0; i < size; ++i)
fill_data_[i & 3] = static_cast<char>(s[i]);
}
};
// Format specifiers for built-in and string types.
struct format_specs : basic_specs {
int width;
int precision;
constexpr format_specs() : width(0), precision(-1) {}
};
/**
* Parsing context consisting of a format string range being parsed and an
* argument counter for automatic indexing.
*/
template <typename Char = char> class parse_context {
private:
basic_string_view<Char> format_str_;
int next_arg_id_;
enum { use_constexpr_cast = !FMT_GCC_VERSION || FMT_GCC_VERSION >= 1200 };
FMT_CONSTEXPR void do_check_arg_id(int arg_id);
public:
using char_type = Char;
using iterator = const Char*;
explicit constexpr parse_context(basic_string_view<Char> format_str,
int next_arg_id = 0)
: format_str_(format_str), next_arg_id_(next_arg_id) {}
/// Returns an iterator to the beginning of the format string range being
/// parsed.
constexpr auto begin() const noexcept -> iterator {
return format_str_.begin();
}
/// Returns an iterator past the end of the format string range being parsed.
constexpr auto end() const noexcept -> iterator { return format_str_.end(); }
/// Advances the begin iterator to `it`.
FMT_CONSTEXPR void advance_to(iterator it) {
format_str_.remove_prefix(detail::to_unsigned(it - begin()));
}
/// Reports an error if using the manual argument indexing; otherwise returns
/// the next argument index and switches to the automatic indexing.
FMT_CONSTEXPR auto next_arg_id() -> int {
if (next_arg_id_ < 0) {
report_error("cannot switch from manual to automatic argument indexing");
return 0;
}
int id = next_arg_id_++;
do_check_arg_id(id);
return id;
}
/// Reports an error if using the automatic argument indexing; otherwise
/// switches to the manual indexing.
FMT_CONSTEXPR void check_arg_id(int id) {
if (next_arg_id_ > 0) {
report_error("cannot switch from automatic to manual argument indexing");
return;
}
next_arg_id_ = -1;
do_check_arg_id(id);
}
FMT_CONSTEXPR void check_arg_id(basic_string_view<Char>) {
next_arg_id_ = -1;
}
FMT_CONSTEXPR void check_dynamic_spec(int arg_id);
};
FMT_END_EXPORT FMT_END_EXPORT
namespace detail { namespace detail {
@ -694,11 +948,6 @@ template <typename S,
typename V = decltype(detail::to_string_view(std::declval<S>()))> typename V = decltype(detail::to_string_view(std::declval<S>()))>
using char_t = typename V::value_type; using char_t = typename V::value_type;
template <typename Char>
using unsigned_char = typename conditional_t<std::is_integral<Char>::value,
std::make_unsigned<Char>,
type_identity<unsigned>>::type;
enum class type { enum class type {
none_type, none_type,
// Integer types should go first, // Integer types should go first,
@ -1025,264 +1274,6 @@ template <typename T, typename Context,
using stored_type_constant = std::integral_constant< using stored_type_constant = std::integral_constant<
type, Context::builtin_types || TYPE == type::int_type ? TYPE type, Context::builtin_types || TYPE == type::int_type ? TYPE
: type::custom_type>; : type::custom_type>;
} // namespace detail
/// Reports a format error at compile time or, via a `format_error` exception,
/// at runtime.
// This function is intentionally not constexpr to give a compile-time error.
FMT_NORETURN FMT_API void report_error(const char* message);
FMT_DEPRECATED FMT_NORETURN inline void throw_format_error(
const char* message) {
report_error(message);
}
enum class presentation_type : unsigned char {
// Common specifiers:
none = 0,
debug = 1, // '?'
string = 2, // 's' (string, bool)
// Integral, bool and character specifiers:
dec = 3, // 'd'
hex, // 'x' or 'X'
oct, // 'o'
bin, // 'b' or 'B'
chr, // 'c'
// String and pointer specifiers:
pointer = 3, // 'p'
// Floating-point specifiers:
exp = 1, // 'e' or 'E' (1 since there is no FP debug presentation)
fixed, // 'f' or 'F'
general, // 'g' or 'G'
hexfloat // 'a' or 'A'
};
enum class align { none, left, right, center, numeric };
enum class sign { none, minus, plus, space };
enum class arg_id_kind { none, index, name };
// Basic format specifiers for built-in and string types.
class basic_specs {
private:
// Data is arranged as follows:
//
// 0 1 2 3
// 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
// |type |align| w | p | s |u|#|L| f | unused |
// +-----+-----+---+---+---+-+-+-+-----+---------------------------+
//
// w - dynamic width info
// p - dynamic precision info
// s - sign
// u - uppercase (e.g. 'X' for 'x')
// # - alternate form ('#')
// L - localized
// f - fill size
//
// Bitfields are not used because of compiler bugs such as gcc bug 61414.
enum : unsigned {
type_mask = 0x00007,
align_mask = 0x00038,
width_mask = 0x000C0,
precision_mask = 0x00300,
sign_mask = 0x00C00,
uppercase_mask = 0x01000,
alternate_mask = 0x02000,
localized_mask = 0x04000,
fill_size_mask = 0x38000,
align_shift = 3,
width_shift = 6,
precision_shift = 8,
sign_shift = 10,
fill_size_shift = 15,
max_fill_size = 4
};
unsigned long data_ = 1 << fill_size_shift;
// Character (code unit) type is erased to prevent template bloat.
char fill_data_[max_fill_size] = {' '};
FMT_CONSTEXPR void set_fill_size(size_t size) {
data_ = (data_ & ~fill_size_mask) | (size << fill_size_shift);
}
public:
constexpr auto type() const -> presentation_type {
return static_cast<presentation_type>(data_ & type_mask);
}
FMT_CONSTEXPR void set_type(presentation_type t) {
data_ = (data_ & ~type_mask) | static_cast<unsigned>(t);
}
constexpr auto align() const -> align {
return static_cast<fmt::align>((data_ & align_mask) >> align_shift);
}
FMT_CONSTEXPR void set_align(fmt::align a) {
data_ = (data_ & ~align_mask) | (static_cast<unsigned>(a) << align_shift);
}
constexpr auto dynamic_width() const -> arg_id_kind {
return static_cast<arg_id_kind>((data_ & width_mask) >> width_shift);
}
FMT_CONSTEXPR void set_dynamic_width(arg_id_kind w) {
data_ = (data_ & ~width_mask) | (static_cast<unsigned>(w) << width_shift);
}
FMT_CONSTEXPR auto dynamic_precision() const -> arg_id_kind {
return static_cast<arg_id_kind>((data_ & precision_mask) >>
precision_shift);
}
FMT_CONSTEXPR void set_dynamic_precision(arg_id_kind p) {
data_ = (data_ & ~precision_mask) |
(static_cast<unsigned>(p) << precision_shift);
}
constexpr bool dynamic() const {
return (data_ & (width_mask | precision_mask)) != 0;
}
constexpr auto sign() const -> sign {
return static_cast<fmt::sign>((data_ & sign_mask) >> sign_shift);
}
FMT_CONSTEXPR void set_sign(fmt::sign s) {
data_ = (data_ & ~sign_mask) | (static_cast<unsigned>(s) << sign_shift);
}
constexpr auto upper() const -> bool { return (data_ & uppercase_mask) != 0; }
FMT_CONSTEXPR void set_upper() { data_ |= uppercase_mask; }
constexpr auto alt() const -> bool { return (data_ & alternate_mask) != 0; }
FMT_CONSTEXPR void set_alt() { data_ |= alternate_mask; }
FMT_CONSTEXPR void clear_alt() { data_ &= ~alternate_mask; }
constexpr auto localized() const -> bool {
return (data_ & localized_mask) != 0;
}
FMT_CONSTEXPR void set_localized() { data_ |= localized_mask; }
constexpr auto fill_size() const -> size_t {
return (data_ & fill_size_mask) >> fill_size_shift;
}
template <typename Char, FMT_ENABLE_IF(std::is_same<Char, char>::value)>
constexpr auto fill() const -> const Char* {
return fill_data_;
}
template <typename Char, FMT_ENABLE_IF(!std::is_same<Char, char>::value)>
constexpr auto fill() const -> const Char* {
return nullptr;
}
template <typename Char> constexpr auto fill_unit() const -> Char {
using uchar = unsigned char;
return static_cast<Char>(static_cast<uchar>(fill_data_[0]) |
(static_cast<uchar>(fill_data_[1]) << 8));
}
FMT_CONSTEXPR void set_fill(char c) {
fill_data_[0] = c;
set_fill_size(1);
}
template <typename Char>
FMT_CONSTEXPR void set_fill(basic_string_view<Char> s) {
auto size = s.size();
set_fill_size(size);
if (size == 1) {
unsigned uchar = static_cast<detail::unsigned_char<Char>>(s[0]);
fill_data_[0] = static_cast<char>(uchar);
fill_data_[1] = static_cast<char>(uchar >> 8);
return;
}
FMT_ASSERT(size <= max_fill_size, "invalid fill");
for (size_t i = 0; i < size; ++i)
fill_data_[i & 3] = static_cast<char>(s[i]);
}
};
// Format specifiers for built-in and string types.
struct format_specs : basic_specs {
int width;
int precision;
constexpr format_specs() : width(0), precision(-1) {}
};
/**
* Parsing context consisting of a format string range being parsed and an
* argument counter for automatic indexing.
* You can use the `format_parse_context` type alias for `char` instead.
*/
FMT_EXPORT
template <typename Char = char> class parse_context {
private:
basic_string_view<Char> format_str_;
int next_arg_id_;
FMT_CONSTEXPR void do_check_arg_id(int id);
public:
using char_type = Char;
using iterator = const Char*;
explicit constexpr parse_context(basic_string_view<Char> format_str,
int next_arg_id = 0)
: format_str_(format_str), next_arg_id_(next_arg_id) {}
/// Returns an iterator to the beginning of the format string range being
/// parsed.
constexpr auto begin() const noexcept -> iterator {
return format_str_.begin();
}
/// Returns an iterator past the end of the format string range being parsed.
constexpr auto end() const noexcept -> iterator { return format_str_.end(); }
/// Advances the begin iterator to `it`.
FMT_CONSTEXPR void advance_to(iterator it) {
format_str_.remove_prefix(detail::to_unsigned(it - begin()));
}
/// Reports an error if using the manual argument indexing; otherwise returns
/// the next argument index and switches to the automatic indexing.
FMT_CONSTEXPR auto next_arg_id() -> int {
if (next_arg_id_ < 0) {
report_error("cannot switch from manual to automatic argument indexing");
return 0;
}
int id = next_arg_id_++;
do_check_arg_id(id);
return id;
}
/// Reports an error if using the automatic argument indexing; otherwise
/// switches to the manual indexing.
FMT_CONSTEXPR void check_arg_id(int id) {
if (next_arg_id_ > 0) {
report_error("cannot switch from automatic to manual argument indexing");
return;
}
next_arg_id_ = -1;
do_check_arg_id(id);
}
FMT_CONSTEXPR void check_arg_id(basic_string_view<Char>) {
next_arg_id_ = -1;
}
FMT_CONSTEXPR void check_dynamic_spec(int arg_id);
};
FMT_EXPORT
template <typename Char> using basic_format_parse_context = parse_context<Char>;
using format_parse_context = parse_context<char>;
namespace detail {
// A parse context with extra data used only in compile-time checks. // A parse context with extra data used only in compile-time checks.
template <typename Char> template <typename Char>
class compile_parse_context : public parse_context<Char> { class compile_parse_context : public parse_context<Char> {
@ -2489,38 +2480,30 @@ inline void vprint_mojibake(FILE*, string_view, const format_args&, bool) {}
#endif #endif
} // namespace detail } // namespace detail
FMT_BEGIN_EXPORT FMT_BEGIN_EXPORT // Main public API:
template <typename Char> template <typename Char>
FMT_CONSTEXPR void parse_context<Char>::do_check_arg_id(int id) { FMT_CONSTEXPR void parse_context<Char>::do_check_arg_id(int arg_id) {
// Argument id is only checked at compile-time during parsing because // Argument id is only checked at compile time during parsing because
// formatting has its own validation. // formatting has its own validation.
if (detail::is_constant_evaluated() && if (detail::is_constant_evaluated() && use_constexpr_cast) {
(!FMT_GCC_VERSION || FMT_GCC_VERSION >= 1200)) {
auto ctx = static_cast<detail::compile_parse_context<Char>*>(this); auto ctx = static_cast<detail::compile_parse_context<Char>*>(this);
if (id >= ctx->num_args()) report_error("argument not found"); if (arg_id >= ctx->num_args()) report_error("argument not found");
} }
} }
template <typename Char> template <typename Char>
FMT_CONSTEXPR void parse_context<Char>::check_dynamic_spec(int arg_id) { FMT_CONSTEXPR void parse_context<Char>::check_dynamic_spec(int arg_id) {
if (detail::is_constant_evaluated() && using detail::compile_parse_context;
(!FMT_GCC_VERSION || FMT_GCC_VERSION >= 1200)) { if (detail::is_constant_evaluated() && use_constexpr_cast)
auto ctx = static_cast<detail::compile_parse_context<Char>*>(this); static_cast<compile_parse_context<Char>*>(this)->check_dynamic_spec(arg_id);
ctx->check_dynamic_spec(arg_id);
}
} }
// An output iterator that appends to a buffer. It is used instead of // An output iterator that appends to a buffer. It is used instead of
// back_insert_iterator to reduce symbol sizes and avoid <iterator> dependency. // back_insert_iterator to reduce symbol sizes and avoid <iterator> dependency.
template <typename T> class basic_appender { template <typename T> class basic_appender {
private: protected:
detail::buffer<T>* buffer_; detail::buffer<T>* container;
friend FMT_CONSTEXPR20 auto get_container(basic_appender app)
-> detail::buffer<T>& {
return *app.buffer_;
}
public: public:
using iterator_category = int; using iterator_category = int;
@ -2531,10 +2514,10 @@ template <typename T> class basic_appender {
using container_type = detail::buffer<T>; using container_type = detail::buffer<T>;
FMT_UNCHECKED_ITERATOR(basic_appender); FMT_UNCHECKED_ITERATOR(basic_appender);
FMT_CONSTEXPR basic_appender(detail::buffer<T>& buf) : buffer_(&buf) {} FMT_CONSTEXPR basic_appender(detail::buffer<T>& buf) : container(&buf) {}
FMT_CONSTEXPR20 auto operator=(T c) -> basic_appender& { FMT_CONSTEXPR20 auto operator=(T c) -> basic_appender& {
buffer_->push_back(c); container->push_back(c);
return *this; return *this;
} }
FMT_CONSTEXPR20 auto operator*() -> basic_appender& { return *this; } FMT_CONSTEXPR20 auto operator*() -> basic_appender& { return *this; }
@ -2809,15 +2792,14 @@ template <typename Char, typename... Args> class basic_format_string {
FMT_CONSTEVAL FMT_ALWAYS_INLINE basic_format_string(const S& s) : str_(s) { FMT_CONSTEVAL FMT_ALWAYS_INLINE basic_format_string(const S& s) : str_(s) {
using namespace detail; using namespace detail;
static_assert( static_assert(
detail::count<(std::is_base_of<view, remove_reference_t<Args>>::value && count<(std::is_base_of<view, remove_reference_t<Args>>::value &&
std::is_reference<Args>::value)...>() == 0, std::is_reference<Args>::value)...>() == 0,
"passing views as lvalues is disallowed"); "passing views as lvalues is disallowed");
if (FMT_USE_CONSTEVAL) parse_format_string<Char>(s, checker(s, arg_pack())); if (FMT_USE_CONSTEVAL) parse_format_string<Char>(s, checker(s, arg_pack()));
#ifdef FMT_ENFORCE_COMPILE_STRING #ifdef FMT_ENFORCE_COMPILE_STRING
static_assert( static_assert(
FMT_USE_CONSTEVAL && sizeof(S) != 0, FMT_USE_CONSTEVAL && sizeof(S) != 0,
"FMT_ENFORCE_COMPILE_STRING requires all format strings to use " "FMT_ENFORCE_COMPILE_STRING requires format strings to use FMT_STRING");
"FMT_STRING");
#endif #endif
} }
template <typename S, template <typename S,