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-rw-r--r--subprojects/fmt/include/fmt/ostream.h224
1 files changed, 130 insertions, 94 deletions
diff --git a/subprojects/fmt/include/fmt/ostream.h b/subprojects/fmt/include/fmt/ostream.h
index 29c58ec..394d947 100644
--- a/subprojects/fmt/include/fmt/ostream.h
+++ b/subprojects/fmt/include/fmt/ostream.h
@@ -8,89 +8,97 @@
#ifndef FMT_OSTREAM_H_
#define FMT_OSTREAM_H_
+#include <fstream>
#include <ostream>
#include "format.h"
FMT_BEGIN_NAMESPACE
-template <typename Char> class basic_printf_parse_context;
template <typename OutputIt, typename Char> class basic_printf_context;
namespace detail {
-template <class Char> class formatbuf : public std::basic_streambuf<Char> {
+// Checks if T has a user-defined operator<<.
+template <typename T, typename Char, typename Enable = void>
+class is_streamable {
private:
- using int_type = typename std::basic_streambuf<Char>::int_type;
- using traits_type = typename std::basic_streambuf<Char>::traits_type;
+ template <typename U>
+ static auto test(int)
+ -> bool_constant<sizeof(std::declval<std::basic_ostream<Char>&>()
+ << std::declval<U>()) != 0>;
+
+ template <typename> static auto test(...) -> std::false_type;
- buffer<Char>& buffer_;
+ using result = decltype(test<T>(0));
public:
- formatbuf(buffer<Char>& buf) : buffer_(buf) {}
-
- protected:
- // The put-area is actually always empty. This makes the implementation
- // simpler and has the advantage that the streambuf and the buffer are always
- // in sync and sputc never writes into uninitialized memory. The obvious
- // disadvantage is that each call to sputc always results in a (virtual) call
- // to overflow. There is no disadvantage here for sputn since this always
- // results in a call to xsputn.
-
- int_type overflow(int_type ch = traits_type::eof()) FMT_OVERRIDE {
- if (!traits_type::eq_int_type(ch, traits_type::eof()))
- buffer_.push_back(static_cast<Char>(ch));
- return ch;
- }
+ is_streamable() = default;
- std::streamsize xsputn(const Char* s, std::streamsize count) FMT_OVERRIDE {
- buffer_.append(s, s + count);
- return count;
- }
+ static const bool value = result::value;
};
-struct converter {
- template <typename T, FMT_ENABLE_IF(is_integral<T>::value)> converter(T);
-};
+// Formatting of built-in types and arrays is intentionally disabled because
+// it's handled by standard (non-ostream) formatters.
+template <typename T, typename Char>
+struct is_streamable<
+ T, Char,
+ enable_if_t<
+ std::is_arithmetic<T>::value || std::is_array<T>::value ||
+ std::is_pointer<T>::value || std::is_same<T, char8_type>::value ||
+ std::is_convertible<T, fmt::basic_string_view<Char>>::value ||
+ std::is_same<T, std_string_view<Char>>::value ||
+ (std::is_convertible<T, int>::value && !std::is_enum<T>::value)>>
+ : std::false_type {};
+
+template <typename Char> FILE* get_file(std::basic_filebuf<Char>&) {
+ return nullptr;
+}
-template <typename Char> struct test_stream : std::basic_ostream<Char> {
- private:
- void_t<> operator<<(converter);
+struct dummy_filebuf {
+ FILE* _Myfile;
};
-
-// Hide insertion operators for built-in types.
-template <typename Char, typename Traits>
-void_t<> operator<<(std::basic_ostream<Char, Traits>&, Char);
-template <typename Char, typename Traits>
-void_t<> operator<<(std::basic_ostream<Char, Traits>&, char);
-template <typename Traits>
-void_t<> operator<<(std::basic_ostream<char, Traits>&, char);
-template <typename Traits>
-void_t<> operator<<(std::basic_ostream<char, Traits>&, signed char);
-template <typename Traits>
-void_t<> operator<<(std::basic_ostream<char, Traits>&, unsigned char);
-
-// Checks if T has a user-defined operator<< (e.g. not a member of
-// std::ostream).
-template <typename T, typename Char> class is_streamable {
- private:
- template <typename U>
- static bool_constant<!std::is_same<decltype(std::declval<test_stream<Char>&>()
- << std::declval<U>()),
- void_t<>>::value>
- test(int);
-
- template <typename> static std::false_type test(...);
-
- using result = decltype(test<T>(0));
-
- public:
- static const bool value = result::value;
+template <typename T, typename U = int> struct ms_filebuf {
+ using type = dummy_filebuf;
};
+template <typename T> struct ms_filebuf<T, decltype(T::_Myfile, 0)> {
+ using type = T;
+};
+using filebuf_type = ms_filebuf<std::filebuf>::type;
+
+FILE* get_file(filebuf_type& buf);
+
+// Generate a unique explicit instantion in every translation unit using a tag
+// type in an anonymous namespace.
+namespace {
+struct filebuf_access_tag {};
+} // namespace
+template <typename Tag, typename FileMemberPtr, FileMemberPtr file>
+class filebuf_access {
+ friend FILE* get_file(filebuf_type& buf) { return buf.*file; }
+};
+template class filebuf_access<filebuf_access_tag,
+ decltype(&filebuf_type::_Myfile),
+ &filebuf_type::_Myfile>;
+
+inline bool write(std::filebuf& buf, fmt::string_view data) {
+ FILE* f = get_file(buf);
+ if (!f) return false;
+ print(f, data);
+ return true;
+}
+inline bool write(std::wfilebuf&, fmt::basic_string_view<wchar_t>) {
+ return false;
+}
// Write the content of buf to os.
+// It is a separate function rather than a part of vprint to simplify testing.
template <typename Char>
void write_buffer(std::basic_ostream<Char>& os, buffer<Char>& buf) {
+ if (const_check(FMT_MSC_VERSION)) {
+ auto filebuf = dynamic_cast<std::basic_filebuf<Char>*>(os.rdbuf());
+ if (filebuf && write(*filebuf, {buf.data(), buf.size()})) return;
+ }
const Char* buf_data = buf.data();
using unsigned_streamsize = std::make_unsigned<std::streamsize>::type;
unsigned_streamsize size = buf.size();
@@ -106,53 +114,74 @@ void write_buffer(std::basic_ostream<Char>& os, buffer<Char>& buf) {
template <typename Char, typename T>
void format_value(buffer<Char>& buf, const T& value,
locale_ref loc = locale_ref()) {
- formatbuf<Char> format_buf(buf);
- std::basic_ostream<Char> output(&format_buf);
+ auto&& format_buf = formatbuf<std::basic_streambuf<Char>>(buf);
+ auto&& output = std::basic_ostream<Char>(&format_buf);
#if !defined(FMT_STATIC_THOUSANDS_SEPARATOR)
if (loc) output.imbue(loc.get<std::locale>());
#endif
output << value;
output.exceptions(std::ios_base::failbit | std::ios_base::badbit);
- buf.try_resize(buf.size());
}
-// Formats an object of type T that has an overloaded ostream operator<<.
-template <typename T, typename Char>
-struct fallback_formatter<T, Char, enable_if_t<is_streamable<T, Char>::value>>
- : private formatter<basic_string_view<Char>, Char> {
- FMT_CONSTEXPR auto parse(basic_format_parse_context<Char>& ctx)
- -> decltype(ctx.begin()) {
- return formatter<basic_string_view<Char>, Char>::parse(ctx);
- }
- template <typename ParseCtx,
- FMT_ENABLE_IF(std::is_same<
- ParseCtx, basic_printf_parse_context<Char>>::value)>
- auto parse(ParseCtx& ctx) -> decltype(ctx.begin()) {
- return ctx.begin();
- }
+template <typename T> struct streamed_view { const T& value; };
- template <typename OutputIt>
- auto format(const T& value, basic_format_context<OutputIt, Char>& ctx)
+} // namespace detail
+
+// Formats an object of type T that has an overloaded ostream operator<<.
+template <typename Char>
+struct basic_ostream_formatter : formatter<basic_string_view<Char>, Char> {
+ template <typename T, typename OutputIt>
+ auto format(const T& value, basic_format_context<OutputIt, Char>& ctx) const
-> OutputIt {
- basic_memory_buffer<Char> buffer;
+ auto buffer = basic_memory_buffer<Char>();
format_value(buffer, value, ctx.locale());
- basic_string_view<Char> str(buffer.data(), buffer.size());
- return formatter<basic_string_view<Char>, Char>::format(str, ctx);
+ return formatter<basic_string_view<Char>, Char>::format(
+ {buffer.data(), buffer.size()}, ctx);
}
+};
+
+using ostream_formatter = basic_ostream_formatter<char>;
+
+template <typename T>
+struct formatter<detail::streamed_view<T>> : ostream_formatter {
template <typename OutputIt>
- auto format(const T& value, basic_printf_context<OutputIt, Char>& ctx)
- -> OutputIt {
- basic_memory_buffer<Char> buffer;
- format_value(buffer, value, ctx.locale());
- return std::copy(buffer.begin(), buffer.end(), ctx.out());
+ auto format(detail::streamed_view<T> view,
+ basic_format_context<OutputIt, char>& ctx) const -> OutputIt {
+ return ostream_formatter::format(view.value, ctx);
}
};
+
+/**
+ \rst
+ Returns a view that formats `value` via an ostream ``operator<<``.
+
+ **Example**::
+
+ fmt::print("Current thread id: {}\n",
+ fmt::streamed(std::this_thread::get_id()));
+ \endrst
+ */
+template <typename T>
+auto streamed(const T& value) -> detail::streamed_view<T> {
+ return {value};
+}
+
+namespace detail {
+
+// Formats an object of type T that has an overloaded ostream operator<<.
+template <typename T, typename Char>
+struct fallback_formatter<T, Char, enable_if_t<is_streamable<T, Char>::value>>
+ : basic_ostream_formatter<Char> {
+ using basic_ostream_formatter<Char>::format;
+};
+
} // namespace detail
-template <typename Char>
-void vprint(std::basic_ostream<Char>& os, basic_string_view<Char> format_str,
+FMT_MODULE_EXPORT template <typename Char>
+void vprint(std::basic_ostream<Char>& os,
+ basic_string_view<type_identity_t<Char>> format_str,
basic_format_args<buffer_context<type_identity_t<Char>>> args) {
- basic_memory_buffer<Char> buffer;
+ auto buffer = basic_memory_buffer<Char>();
detail::vformat_to(buffer, format_str, args);
detail::write_buffer(os, buffer);
}
@@ -166,12 +195,19 @@ void vprint(std::basic_ostream<Char>& os, basic_string_view<Char> format_str,
fmt::print(cerr, "Don't {}!", "panic");
\endrst
*/
-template <typename S, typename... Args,
- typename Char = enable_if_t<detail::is_string<S>::value, char_t<S>>>
-void print(std::basic_ostream<Char>& os, const S& format_str, Args&&... args) {
- vprint(os, to_string_view(format_str),
- fmt::make_args_checked<Args...>(format_str, args...));
+FMT_MODULE_EXPORT template <typename... T>
+void print(std::ostream& os, format_string<T...> fmt, T&&... args) {
+ vprint(os, fmt, fmt::make_format_args(args...));
}
+
+FMT_MODULE_EXPORT
+template <typename... Args>
+void print(std::wostream& os,
+ basic_format_string<wchar_t, type_identity_t<Args>...> fmt,
+ Args&&... args) {
+ vprint(os, fmt, fmt::make_format_args<buffer_context<wchar_t>>(args...));
+}
+
FMT_END_NAMESPACE
#endif // FMT_OSTREAM_H_