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Simplify variadic functions

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This commit is contained in:
Victor Zverovich
2018-09-30 17:45:14 -07:00
parent 3f4cfa6c60
commit 2d7d0835d7
1 changed files with 41 additions and 44 deletions
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73
include/fmt/core.h
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@ -1068,6 +1068,8 @@ class format_arg_store {
format_arg_store(const Args &... args) format_arg_store(const Args &... args)
: data_{internal::make_arg<IS_PACKED, Context>(args)...} {} : data_{internal::make_arg<IS_PACKED, Context>(args)...} {}
#endif #endif
basic_format_args<Context> operator*() const { return *this; }
}; };
#if !FMT_USE_CONSTEXPR11 #if !FMT_USE_CONSTEXPR11
@ -1307,19 +1309,19 @@ std::basic_string<Char> vformat(
basic_format_args<typename buffer_context<Char>::type> args); basic_format_args<typename buffer_context<Char>::type> args);
} // namespace internal } // namespace internal
template <typename String> template <typename S>
format_context::iterator vformat_to( format_context::iterator vformat_to(
internal::basic_buffer<FMT_CHAR(String)> &buf, const String &format_str, internal::basic_buffer<FMT_CHAR(S)> &buf, const S &format_str,
basic_format_args<buffer_context<FMT_CHAR(String)> > args); basic_format_args<buffer_context<FMT_CHAR(S)> > args);
template <typename Container> template <typename Container>
struct is_contiguous : std::false_type {}; struct is_contiguous: std::false_type {};
template <typename Char> template <typename Char>
struct is_contiguous<std::basic_string<Char>> : std::true_type {}; struct is_contiguous<std::basic_string<Char> >: std::true_type {};
template <typename Char> template <typename Char>
struct is_contiguous<internal::basic_buffer<Char>> : std::true_type {}; struct is_contiguous<internal::basic_buffer<Char> >: std::true_type {};
/** Formats a string and writes the output to ``out``. */ /** Formats a string and writes the output to ``out``. */
template <typename Container> template <typename Container>
@ -1342,22 +1344,21 @@ typename std::enable_if<
return out; return out;
} }
template <typename Container, typename String, typename... Args> template <typename Container, typename S, typename... Args>
inline typename std::enable_if< inline typename std::enable_if<
is_contiguous<Container>::value && internal::is_format_string<String>::value, is_contiguous<Container>::value && internal::is_format_string<S>::value,
std::back_insert_iterator<Container>>::type std::back_insert_iterator<Container>>::type
format_to(std::back_insert_iterator<Container> out, format_to(std::back_insert_iterator<Container> out, const S &format_str,
const String &format_str, const Args &... args) { const Args &... args) {
internal::check_format_string<Args...>(format_str); internal::check_format_string<Args...>(format_str);
typedef typename buffer_context< FMT_CHAR(String)>::type context_t; format_arg_store<
format_arg_store<context_t, Args...> as{args...}; typename buffer_context<FMT_CHAR(S)>::type, Args...> as(args...);
return vformat_to(out, basic_string_view< FMT_CHAR(String)>(format_str), return vformat_to(out, basic_string_view<FMT_CHAR(S)>(format_str), as);
basic_format_args<context_t>(as));
} }
template <typename String, typename Char = FMT_CHAR(String)> template <typename S, typename Char = FMT_CHAR(S)>
inline std::basic_string<Char> vformat( inline std::basic_string<Char> vformat(
const String &format_str, const S &format_str,
basic_format_args<typename buffer_context<Char>::type> args) { basic_format_args<typename buffer_context<Char>::type> args) {
// Convert format string to string_view to reduce the number of overloads. // Convert format string to string_view to reduce the number of overloads.
return internal::vformat(basic_string_view<Char>(format_str), args); return internal::vformat(basic_string_view<Char>(format_str), args);
@ -1373,17 +1374,16 @@ inline std::basic_string<Char> vformat(
std::string message = fmt::format("The answer is {}", 42); std::string message = fmt::format("The answer is {}", 42);
\endrst \endrst
*/ */
template <typename String, typename... Args> template <typename S, typename... Args>
inline std::basic_string< FMT_CHAR(String)> format( inline std::basic_string<FMT_CHAR(S)> format(
const String &format_str, const Args &... args) { const S &format_str, const Args &... args) {
internal::check_format_string<Args...>(format_str); internal::check_format_string<Args...>(format_str);
// This should be just // This should be just
// return vformat(format_str, make_format_args(args...)); // return vformat(format_str, make_format_args(args...));
// but gcc has trouble optimizing the latter, so break it down. // but gcc has trouble optimizing the latter, so break it down.
typedef typename buffer_context< FMT_CHAR(String)>::type context_t; format_arg_store<
format_arg_store<context_t, Args...> as{args...}; typename buffer_context<FMT_CHAR(S)>::type, Args...> as(args...);
return internal::vformat(basic_string_view<FMT_CHAR(String)>(format_str), return internal::vformat(basic_string_view<FMT_CHAR(S)>(format_str), *as);
basic_format_args<context_t>(as));
} }
FMT_API void vprint(std::FILE *f, string_view format_str, format_args args); FMT_API void vprint(std::FILE *f, string_view format_str, format_args args);
@ -1398,17 +1398,15 @@ FMT_API void vprint(std::FILE *f, wstring_view format_str, wformat_args args);
**Example**:: **Example**::
fmt::print(stderr, "Don't {}!", "panic"); fmt::print(stderr, "Don't {}!", "panic");
\endrst \endrst
*/ */
template <typename String, typename... Args> template <typename S, typename... Args>
inline typename std::enable_if<internal::is_format_string<String>::value>::type inline typename std::enable_if<internal::is_format_string<S>::value>::type
print(std::FILE *f, const String &format_str, const Args &... args) { print(std::FILE *f, const S &format_str, const Args &... args) {
internal::check_format_string<Args...>(format_str); internal::check_format_string<Args...>(format_str);
typedef typename buffer_context< FMT_CHAR(String)>::type context_t; format_arg_store<
format_arg_store<context_t, Args...> as{ args... }; typename buffer_context<FMT_CHAR(S)>::type, Args...> as(args...);
vprint(f, basic_string_view< FMT_CHAR(String)>(format_str), vprint(f, basic_string_view<FMT_CHAR(S)>(format_str), as);
basic_format_args<context_t>(as));
} }
FMT_API void vprint(string_view format_str, format_args args); FMT_API void vprint(string_view format_str, format_args args);
@ -1423,14 +1421,13 @@ FMT_API void vprint(wstring_view format_str, wformat_args args);
fmt::print("Elapsed time: {0:.2f} seconds", 1.23); fmt::print("Elapsed time: {0:.2f} seconds", 1.23);
\endrst \endrst
*/ */
template <typename String, typename... Args> template <typename S, typename... Args>
inline typename std::enable_if<internal::is_format_string<String>::value>::type inline typename std::enable_if<internal::is_format_string<S>::value>::type
print(const String &format_str, const Args &... args) { print(const S &format_str, const Args &... args) {
internal::check_format_string<Args...>(format_str); internal::check_format_string<Args...>(format_str);
typedef typename buffer_context<FMT_CHAR(String)>::type context_t; format_arg_store<
format_arg_store<context_t, Args...> as{ args... }; typename buffer_context<FMT_CHAR(S)>::type, Args...> as(args...);
vprint(basic_string_view<FMT_CHAR(String)>(format_str), vprint(basic_string_view<FMT_CHAR(S)>(format_str), as);
basic_format_args<context_t>(as));
} }
FMT_END_NAMESPACE FMT_END_NAMESPACE