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Format the code using clang-format

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This commit is contained in:
Victor Zverovich
2019-01-12 18:27:38 -08:00
parent 9a777b9e1c
commit 58b6f8db48
39 changed files with 4734 additions and 5108 deletions
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347
include/fmt/printf.h
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@@ -18,95 +18,91 @@ namespace internal {
// Checks if a value fits in int - used to avoid warnings about comparing
// signed and unsigned integers.
template <bool IsSigned>
struct int_checker {
template <typename T>
static bool fits_in_int(T value) {
template <bool IsSigned> struct int_checker {
template <typename T> static bool fits_in_int(T value) {
unsigned max = std::numeric_limits<int>::max();
return value <= max;
}
static bool fits_in_int(bool) { return true; }
};
template <>
struct int_checker<true> {
template <typename T>
static bool fits_in_int(T value) {
template <> struct int_checker<true> {
template <typename T> static bool fits_in_int(T value) {
return value >= std::numeric_limits<int>::min() &&
value <= std::numeric_limits<int>::max();
}
static bool fits_in_int(int) { return true; }
};
class printf_precision_handler: public function<int> {
class printf_precision_handler : public function<int> {
public:
template <typename T>
typename std::enable_if<std::is_integral<T>::value, int>::type
operator()(T value) {
typename std::enable_if<std::is_integral<T>::value, int>::type operator()(
T value) {
if (!int_checker<std::numeric_limits<T>::is_signed>::fits_in_int(value))
FMT_THROW(format_error("number is too big"));
return static_cast<int>(value);
}
template <typename T>
typename std::enable_if<!std::is_integral<T>::value, int>::type operator()(T) {
typename std::enable_if<!std::is_integral<T>::value, int>::type operator()(
T) {
FMT_THROW(format_error("precision is not integer"));
return 0;
}
};
// An argument visitor that returns true iff arg is a zero integer.
class is_zero_int: public function<bool> {
class is_zero_int : public function<bool> {
public:
template <typename T>
typename std::enable_if<std::is_integral<T>::value, bool>::type
operator()(T value) { return value == 0; }
typename std::enable_if<std::is_integral<T>::value, bool>::type operator()(
T value) {
return value == 0;
}
template <typename T>
typename std::enable_if<!std::is_integral<T>::value, bool>::type
operator()(T) { return false; }
typename std::enable_if<!std::is_integral<T>::value, bool>::type operator()(
T) {
return false;
}
};
template <typename T>
struct make_unsigned_or_bool : std::make_unsigned<T> {};
template <typename T> struct make_unsigned_or_bool : std::make_unsigned<T> {};
template <>
struct make_unsigned_or_bool<bool> {
typedef bool type;
};
template <> struct make_unsigned_or_bool<bool> { typedef bool type; };
template <typename T, typename Context>
class arg_converter: public function<void> {
class arg_converter : public function<void> {
private:
typedef typename Context::char_type Char;
basic_format_arg<Context> &arg_;
basic_format_arg<Context>& arg_;
typename Context::char_type type_;
public:
arg_converter(basic_format_arg<Context> &arg, Char type)
: arg_(arg), type_(type) {}
arg_converter(basic_format_arg<Context>& arg, Char type)
: arg_(arg), type_(type) {}
void operator()(bool value) {
if (type_ != 's')
operator()<bool>(value);
if (type_ != 's') operator()<bool>(value);
}
template <typename U>
typename std::enable_if<std::is_integral<U>::value>::type
operator()(U value) {
typename std::enable_if<std::is_integral<U>::value>::type operator()(
U value) {
bool is_signed = type_ == 'd' || type_ == 'i';
typedef typename std::conditional<
std::is_same<T, void>::value, U, T>::type TargetType;
typedef typename std::conditional<std::is_same<T, void>::value, U, T>::type
TargetType;
if (const_check(sizeof(TargetType) <= sizeof(int))) {
// Extra casts are used to silence warnings.
if (is_signed) {
arg_ = internal::make_arg<Context>(
static_cast<int>(static_cast<TargetType>(value)));
static_cast<int>(static_cast<TargetType>(value)));
} else {
typedef typename make_unsigned_or_bool<TargetType>::type Unsigned;
arg_ = internal::make_arg<Context>(
static_cast<unsigned>(static_cast<Unsigned>(value)));
static_cast<unsigned>(static_cast<Unsigned>(value)));
}
} else {
if (is_signed) {
@@ -116,7 +112,7 @@ class arg_converter: public function<void> {
arg_ = internal::make_arg<Context>(static_cast<long long>(value));
} else {
arg_ = internal::make_arg<Context>(
static_cast<typename make_unsigned_or_bool<U>::type>(value));
static_cast<typename make_unsigned_or_bool<U>::type>(value));
}
}
}
@@ -132,22 +128,21 @@ class arg_converter: public function<void> {
// type depending on the type specifier: 'd' and 'i' - signed, other -
// unsigned).
template <typename T, typename Context, typename Char>
void convert_arg(basic_format_arg<Context> &arg, Char type) {
void convert_arg(basic_format_arg<Context>& arg, Char type) {
visit_format_arg(arg_converter<T, Context>(arg, type), arg);
}
// Converts an integer argument to char for printf.
template <typename Context>
class char_converter: public function<void> {
template <typename Context> class char_converter : public function<void> {
private:
basic_format_arg<Context> &arg_;
basic_format_arg<Context>& arg_;
public:
explicit char_converter(basic_format_arg<Context> &arg) : arg_(arg) {}
explicit char_converter(basic_format_arg<Context>& arg) : arg_(arg) {}
template <typename T>
typename std::enable_if<std::is_integral<T>::value>::type
operator()(T value) {
typename std::enable_if<std::is_integral<T>::value>::type operator()(
T value) {
typedef typename Context::char_type Char;
arg_ = internal::make_arg<Context>(static_cast<Char>(value));
}
@@ -161,18 +156,18 @@ class char_converter: public function<void> {
// Checks if an argument is a valid printf width specifier and sets
// left alignment if it is negative.
template <typename Char>
class printf_width_handler: public function<unsigned> {
class printf_width_handler : public function<unsigned> {
private:
typedef basic_format_specs<Char> format_specs;
format_specs &spec_;
format_specs& spec_;
public:
explicit printf_width_handler(format_specs &spec) : spec_(spec) {}
explicit printf_width_handler(format_specs& spec) : spec_(spec) {}
template <typename T>
typename std::enable_if<std::is_integral<T>::value, unsigned>::type
operator()(T value) {
operator()(T value) {
typedef typename internal::int_traits<T>::main_type UnsignedType;
UnsignedType width = static_cast<UnsignedType>(value);
if (internal::is_negative(value)) {
@@ -180,21 +175,20 @@ class printf_width_handler: public function<unsigned> {
width = 0 - width;
}
unsigned int_max = std::numeric_limits<int>::max();
if (width > int_max)
FMT_THROW(format_error("number is too big"));
if (width > int_max) FMT_THROW(format_error("number is too big"));
return static_cast<unsigned>(width);
}
template <typename T>
typename std::enable_if<!std::is_integral<T>::value, unsigned>::type
operator()(T) {
operator()(T) {
FMT_THROW(format_error("width is not integer"));
return 0;
}
};
template <typename Char, typename Context>
void printf(basic_buffer<Char> &buf, basic_string_view<Char> format,
void printf(basic_buffer<Char>& buf, basic_string_view<Char> format,
basic_format_args<Context> args) {
Context(std::back_inserter(buf), format, args).format();
}
@@ -202,13 +196,11 @@ void printf(basic_buffer<Char> &buf, basic_string_view<Char> format,
using internal::printf; // For printing into memory_buffer.
template <typename Range>
class printf_arg_formatter;
template <typename Range> class printf_arg_formatter;
template <
typename OutputIt, typename Char,
typename ArgFormatter =
printf_arg_formatter<back_insert_range<internal::basic_buffer<Char>>>>
template <typename OutputIt, typename Char,
typename ArgFormatter = printf_arg_formatter<
back_insert_range<internal::basic_buffer<Char>>>>
class basic_printf_context;
/**
@@ -217,17 +209,17 @@ class basic_printf_context;
\endrst
*/
template <typename Range>
class printf_arg_formatter:
public internal::function<
typename internal::arg_formatter_base<Range>::iterator>,
public internal::arg_formatter_base<Range> {
class printf_arg_formatter
: public internal::function<
typename internal::arg_formatter_base<Range>::iterator>,
public internal::arg_formatter_base<Range> {
private:
typedef typename Range::value_type char_type;
typedef decltype(internal::declval<Range>().begin()) iterator;
typedef internal::arg_formatter_base<Range> base;
typedef basic_printf_context<iterator, char_type> context_type;
context_type &context_;
context_type& context_;
void write_null_pointer(char) {
this->spec()->type = 0;
@@ -249,25 +241,24 @@ class printf_arg_formatter:
specifier information for standard argument types.
\endrst
*/
printf_arg_formatter(internal::basic_buffer<char_type> &buffer,
format_specs &spec, context_type &ctx)
: base(back_insert_range<internal::basic_buffer<char_type>>(buffer), &spec,
ctx.locale()),
context_(ctx) {}
printf_arg_formatter(internal::basic_buffer<char_type>& buffer,
format_specs& spec, context_type& ctx)
: base(back_insert_range<internal::basic_buffer<char_type>>(buffer),
&spec, ctx.locale()),
context_(ctx) {}
template <typename T>
typename std::enable_if<std::is_integral<T>::value, iterator>::type
operator()(T value) {
operator()(T value) {
// MSVC2013 fails to compile separate overloads for bool and char_type so
// use std::is_same instead.
if (std::is_same<T, bool>::value) {
format_specs &fmt_spec = *this->spec();
if (fmt_spec.type != 's')
return base::operator()(value ? 1 : 0);
format_specs& fmt_spec = *this->spec();
if (fmt_spec.type != 's') return base::operator()(value ? 1 : 0);
fmt_spec.type = 0;
this->write(value != 0);
} else if (std::is_same<T, char_type>::value) {
format_specs &fmt_spec = *this->spec();
format_specs& fmt_spec = *this->spec();
if (fmt_spec.type && fmt_spec.type != 'c')
return (*this)(static_cast<int>(value));
fmt_spec.flags = 0;
@@ -281,12 +272,12 @@ class printf_arg_formatter:
template <typename T>
typename std::enable_if<std::is_floating_point<T>::value, iterator>::type
operator()(T value) {
operator()(T value) {
return base::operator()(value);
}
/** Formats a null-terminated C string. */
iterator operator()(const char *value) {
iterator operator()(const char* value) {
if (value)
base::operator()(value);
else if (this->spec()->type == 'p')
@@ -297,7 +288,7 @@ class printf_arg_formatter:
}
/** Formats a null-terminated wide C string. */
iterator operator()(const wchar_t *value) {
iterator operator()(const wchar_t* value) {
if (value)
base::operator()(value);
else if (this->spec()->type == 'p')
@@ -311,14 +302,11 @@ class printf_arg_formatter:
return base::operator()(value);
}
iterator operator()(monostate value) {
return base::operator()(value);
}
iterator operator()(monostate value) { return base::operator()(value); }
/** Formats a pointer. */
iterator operator()(const void *value) {
if (value)
return base::operator()(value);
iterator operator()(const void* value) {
if (value) return base::operator()(value);
this->spec()->type = 0;
write_null_pointer(char_type());
return this->out();
@@ -331,13 +319,14 @@ class printf_arg_formatter:
}
};
template <typename T>
struct printf_formatter {
template <typename T> struct printf_formatter {
template <typename ParseContext>
auto parse(ParseContext &ctx) -> decltype(ctx.begin()) { return ctx.begin(); }
auto parse(ParseContext& ctx) -> decltype(ctx.begin()) {
return ctx.begin();
}
template <typename FormatContext>
auto format(const T &value, FormatContext &ctx) -> decltype(ctx.out()) {
auto format(const T& value, FormatContext& ctx) -> decltype(ctx.out()) {
internal::format_value(internal::get_container(ctx.out()), value);
return ctx.out();
}
@@ -346,30 +335,31 @@ struct printf_formatter {
/** This template formats data and writes the output to a writer. */
template <typename OutputIt, typename Char, typename ArgFormatter>
class basic_printf_context :
// Inherit publicly as a workaround for the icc bug
// https://software.intel.com/en-us/forums/intel-c-compiler/topic/783476.
public internal::context_base<
OutputIt, basic_printf_context<OutputIt, Char, ArgFormatter>, Char> {
// Inherit publicly as a workaround for the icc bug
// https://software.intel.com/en-us/forums/intel-c-compiler/topic/783476.
public internal::context_base<
OutputIt, basic_printf_context<OutputIt, Char, ArgFormatter>, Char> {
public:
/** The character type for the output. */
typedef Char char_type;
template <typename T>
struct formatter_type { typedef printf_formatter<T> type; };
template <typename T> struct formatter_type {
typedef printf_formatter<T> type;
};
private:
typedef internal::context_base<OutputIt, basic_printf_context, Char> base;
typedef typename base::format_arg format_arg;
typedef basic_format_specs<char_type> format_specs;
static void parse_flags(format_specs &spec, const Char *&it, const Char *end);
static void parse_flags(format_specs& spec, const Char*& it, const Char* end);
// Returns the argument with specified index or, if arg_index is equal
// to the maximum unsigned value, the next argument.
format_arg get_arg(unsigned arg_index = std::numeric_limits<unsigned>::max());
// Parses argument index, flags and width and returns the argument index.
unsigned parse_header(const Char *&it, const Char *end, format_specs &spec);
unsigned parse_header(const Char*& it, const Char* end, format_specs& spec);
public:
/**
@@ -381,45 +371,46 @@ class basic_printf_context :
*/
basic_printf_context(OutputIt out, basic_string_view<char_type> format_str,
basic_format_args<basic_printf_context> args)
: base(out, format_str, args) {}
: base(out, format_str, args) {}
using base::parse_context;
using base::out;
using base::advance_to;
using base::out;
using base::parse_context;
/** Formats stored arguments and writes the output to the range. */
void format();
};
template <typename OutputIt, typename Char, typename AF>
void basic_printf_context<OutputIt, Char, AF>::parse_flags(
format_specs &spec, const Char *&it, const Char *end) {
void basic_printf_context<OutputIt, Char, AF>::parse_flags(format_specs& spec,
const Char*& it,
const Char* end) {
for (; it != end; ++it) {
switch (*it) {
case '-':
spec.align_ = ALIGN_LEFT;
break;
case '+':
spec.flags |= SIGN_FLAG | PLUS_FLAG;
break;
case '0':
spec.fill_ = '0';
break;
case ' ':
spec.flags |= SIGN_FLAG;
break;
case '#':
spec.flags |= HASH_FLAG;
break;
default:
return;
case '-':
spec.align_ = ALIGN_LEFT;
break;
case '+':
spec.flags |= SIGN_FLAG | PLUS_FLAG;
break;
case '0':
spec.fill_ = '0';
break;
case ' ':
spec.flags |= SIGN_FLAG;
break;
case '#':
spec.flags |= HASH_FLAG;
break;
default:
return;
}
}
}
template <typename OutputIt, typename Char, typename AF>
typename basic_printf_context<OutputIt, Char, AF>::format_arg
basic_printf_context<OutputIt, Char, AF>::get_arg(unsigned arg_index) {
basic_printf_context<OutputIt, Char, AF>::get_arg(unsigned arg_index) {
if (arg_index == std::numeric_limits<unsigned>::max())
return this->do_get_arg(this->parse_context().next_arg_id());
return base::get_arg(arg_index - 1);
@@ -427,7 +418,7 @@ typename basic_printf_context<OutputIt, Char, AF>::format_arg
template <typename OutputIt, typename Char, typename AF>
unsigned basic_printf_context<OutputIt, Char, AF>::parse_header(
const Char *&it, const Char *end, format_specs &spec) {
const Char*& it, const Char* end, format_specs& spec) {
unsigned arg_index = std::numeric_limits<unsigned>::max();
char_type c = *it;
if (c >= '0' && c <= '9') {
@@ -439,8 +430,7 @@ unsigned basic_printf_context<OutputIt, Char, AF>::parse_header(
++it;
arg_index = value;
} else {
if (c == '0')
spec.fill_ = '0';
if (c == '0') spec.fill_ = '0';
if (value != 0) {
// Nonzero value means that we parsed width and don't need to
// parse it or flags again, so return now.
@@ -458,7 +448,7 @@ unsigned basic_printf_context<OutputIt, Char, AF>::parse_header(
} else if (*it == '*') {
++it;
spec.width_ = visit_format_arg(
internal::printf_width_handler<char_type>(spec), get_arg());
internal::printf_width_handler<char_type>(spec), get_arg());
}
}
return arg_index;
@@ -466,10 +456,10 @@ unsigned basic_printf_context<OutputIt, Char, AF>::parse_header(
template <typename OutputIt, typename Char, typename AF>
void basic_printf_context<OutputIt, Char, AF>::format() {
auto &buffer = internal::get_container(this->out());
auto& buffer = internal::get_container(this->out());
const auto range = this->parse_context();
const Char * end = range.end();
const Char * start = range.begin();
const Char* end = range.end();
const Char* start = range.begin();
auto it = start;
while (it != end) {
char_type c = *it++;
@@ -505,7 +495,8 @@ void basic_printf_context<OutputIt, Char, AF>::format() {
format_arg arg = get_arg(arg_index);
if (spec.has(HASH_FLAG) && visit_format_arg(internal::is_zero_int(), arg))
spec.flags = static_cast<uint_least8_t>(spec.flags & (~internal::to_unsigned<int>(HASH_FLAG)));
spec.flags = static_cast<uint_least8_t>(
spec.flags & (~internal::to_unsigned<int>(HASH_FLAG)));
if (spec.fill_ == '0') {
if (arg.is_arithmetic())
spec.align_ = ALIGN_NUMERIC;
@@ -555,19 +546,19 @@ void basic_printf_context<OutputIt, Char, AF>::format() {
}
// Parse type.
if (it == end)
FMT_THROW(format_error("invalid format string"));
if (it == end) FMT_THROW(format_error("invalid format string"));
spec.type = static_cast<char>(*it++);
if (arg.is_integral()) {
// Normalize type.
switch (spec.type) {
case 'i': case 'u':
case 'i':
case 'u':
spec.type = 'd';
break;
case 'c':
// TODO: handle wchar_t better?
visit_format_arg(
internal::char_converter<basic_printf_context>(arg), arg);
visit_format_arg(internal::char_converter<basic_printf_context>(arg),
arg);
break;
}
}
@@ -580,10 +571,10 @@ void basic_printf_context<OutputIt, Char, AF>::format() {
buffer.append(start, it);
}
template <typename Buffer>
struct basic_printf_context_t {
typedef basic_printf_context<
std::back_insert_iterator<Buffer>, typename Buffer::value_type> type;
template <typename Buffer> struct basic_printf_context_t {
typedef basic_printf_context<std::back_insert_iterator<Buffer>,
typename Buffer::value_type>
type;
};
typedef basic_printf_context_t<internal::buffer>::type printf_context;
@@ -595,28 +586,33 @@ typedef basic_format_args<wprintf_context> wprintf_args;
/**
\rst
Constructs an `~fmt::format_arg_store` object that contains references to
arguments and can be implicitly converted to `~fmt::printf_args`.
arguments and can be implicitly converted to `~fmt::printf_args`.
\endrst
*/
template<typename... Args>
inline format_arg_store<printf_context, Args...>
make_printf_args(const Args &... args) { return {args...}; }
template <typename... Args>
inline format_arg_store<printf_context, Args...> make_printf_args(
const Args&... args) {
return {args...};
}
/**
\rst
Constructs an `~fmt::format_arg_store` object that contains references to
arguments and can be implicitly converted to `~fmt::wprintf_args`.
arguments and can be implicitly converted to `~fmt::wprintf_args`.
\endrst
*/
template<typename... Args>
inline format_arg_store<wprintf_context, Args...>
make_wprintf_args(const Args &... args) { return {args...}; }
template <typename... Args>
inline format_arg_store<wprintf_context, Args...> make_wprintf_args(
const Args&... args) {
return {args...};
}
template <typename S, typename Char = FMT_CHAR(S)>
inline std::basic_string<Char>
vsprintf(const S &format,
basic_format_args<typename basic_printf_context_t<
internal::basic_buffer<Char>>::type> args) {
inline std::basic_string<Char> vsprintf(
const S& format,
basic_format_args<
typename basic_printf_context_t<internal::basic_buffer<Char>>::type>
args) {
basic_memory_buffer<Char> buffer;
printf(buffer, to_string_view(format), args);
return to_string(buffer);
@@ -632,26 +628,28 @@ vsprintf(const S &format,
\endrst
*/
template <typename S, typename... Args>
inline FMT_ENABLE_IF_T(
internal::is_string<S>::value, std::basic_string<FMT_CHAR(S)>)
sprintf(const S &format, const Args & ... args) {
inline FMT_ENABLE_IF_T(internal::is_string<S>::value,
std::basic_string<FMT_CHAR(S)>)
sprintf(const S& format, const Args&... args) {
internal::check_format_string<Args...>(format);
typedef internal::basic_buffer<FMT_CHAR(S)> buffer;
typedef typename basic_printf_context_t<buffer>::type context;
format_arg_store<context, Args...> as{ args... };
return vsprintf(to_string_view(format),
basic_format_args<context>(as));
format_arg_store<context, Args...> as{args...};
return vsprintf(to_string_view(format), basic_format_args<context>(as));
}
template <typename S, typename Char = FMT_CHAR(S)>
inline int vfprintf(std::FILE *f, const S &format,
basic_format_args<typename basic_printf_context_t<
internal::basic_buffer<Char>>::type> args) {
inline int vfprintf(
std::FILE* f, const S& format,
basic_format_args<
typename basic_printf_context_t<internal::basic_buffer<Char>>::type>
args) {
basic_memory_buffer<Char> buffer;
printf(buffer, to_string_view(format), args);
std::size_t size = buffer.size();
return std::fwrite(
buffer.data(), sizeof(Char), size, f) < size ? -1 : static_cast<int>(size);
return std::fwrite(buffer.data(), sizeof(Char), size, f) < size
? -1
: static_cast<int>(size);
}
/**
@@ -665,19 +663,20 @@ inline int vfprintf(std::FILE *f, const S &format,
*/
template <typename S, typename... Args>
inline FMT_ENABLE_IF_T(internal::is_string<S>::value, int)
fprintf(std::FILE *f, const S &format, const Args & ... args) {
fprintf(std::FILE* f, const S& format, const Args&... args) {
internal::check_format_string<Args...>(format);
typedef internal::basic_buffer<FMT_CHAR(S)> buffer;
typedef typename basic_printf_context_t<buffer>::type context;
format_arg_store<context, Args...> as{ args... };
return vfprintf(f, to_string_view(format),
basic_format_args<context>(as));
format_arg_store<context, Args...> as{args...};
return vfprintf(f, to_string_view(format), basic_format_args<context>(as));
}
template <typename S, typename Char = FMT_CHAR(S)>
inline int vprintf(const S &format,
basic_format_args<typename basic_printf_context_t<
internal::basic_buffer<Char>>::type> args) {
inline int vprintf(
const S& format,
basic_format_args<
typename basic_printf_context_t<internal::basic_buffer<Char>>::type>
args) {
return vfprintf(stdout, to_string_view(format), args);
}
@@ -692,20 +691,20 @@ inline int vprintf(const S &format,
*/
template <typename S, typename... Args>
inline FMT_ENABLE_IF_T(internal::is_string<S>::value, int)
printf(const S &format_str, const Args & ... args) {
printf(const S& format_str, const Args&... args) {
internal::check_format_string<Args...>(format_str);
typedef internal::basic_buffer<FMT_CHAR(S)> buffer;
typedef typename basic_printf_context_t<buffer>::type context;
format_arg_store<context, Args...> as{ args... };
return vprintf(to_string_view(format_str),
basic_format_args<context>(as));
format_arg_store<context, Args...> as{args...};
return vprintf(to_string_view(format_str), basic_format_args<context>(as));
}
template <typename S, typename Char = FMT_CHAR(S)>
inline int vfprintf(std::basic_ostream<Char> &os,
const S &format,
basic_format_args<typename basic_printf_context_t<
internal::basic_buffer<Char>>::type> args) {
inline int vfprintf(
std::basic_ostream<Char>& os, const S& format,
basic_format_args<
typename basic_printf_context_t<internal::basic_buffer<Char>>::type>
args) {
basic_memory_buffer<Char> buffer;
printf(buffer, to_string_view(format), args);
internal::write(os, buffer);
@@ -723,12 +722,12 @@ inline int vfprintf(std::basic_ostream<Char> &os,
*/
template <typename S, typename... Args>
inline FMT_ENABLE_IF_T(internal::is_string<S>::value, int)
fprintf(std::basic_ostream<FMT_CHAR(S)> &os,
const S &format_str, const Args & ... args) {
fprintf(std::basic_ostream<FMT_CHAR(S)>& os, const S& format_str,
const Args&... args) {
internal::check_format_string<Args...>(format_str);
typedef internal::basic_buffer<FMT_CHAR(S)> buffer;
typedef typename basic_printf_context_t<buffer>::type context;
format_arg_store<context, Args...> as{ args... };
format_arg_store<context, Args...> as{args...};
return vfprintf(os, to_string_view(format_str),
basic_format_args<context>(as));
}