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Replace template recursion with variadic array initialization

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This commit is contained in:
Dean Moldovan 2015-10-25 04:23:40 +01:00
parent 1383efb6c0
commit f9428560df
1 changed files with 26 additions and 43 deletions
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69
format.h
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@ -1203,6 +1203,10 @@ class MakeValue : public Value {
template <typename Formatter>
class MakeArg : public Arg {
public:
MakeArg() {
type = Arg::NONE;
}
template <typename T>
MakeArg(const T &x) {
value = MakeValue<Formatter>(x);
@ -1900,6 +1904,22 @@ inline uint64_t make_type(const T &arg) {
return MakeValue< BasicFormatter<char> >::type(arg);
}
#if FMT_USE_VARIADIC_TEMPLATES
template <typename Formatter, unsigned N>
using ArgArray = typename Conditional<
N < ArgList::MAX_PACKED_ARGS,
MakeValue<Formatter>[(N > 0) ? N : 1],
MakeArg<Formatter>[N + 1]
>::type;
template <typename Arg, typename... Args>
inline uint64_t make_type(const Arg &first, const Args & ... tail) {
return make_type(first) | (make_type(tail...) << 4);
}
#else // FMT_USE_VARIADIC_TEMPLATES
template <unsigned N>
struct ArgArray {
// Computes the argument array size by adding 1 to N, which is the number of
@ -1912,40 +1932,6 @@ struct ArgArray {
(N < ArgList::MAX_PACKED_ARGS), Value, Arg>::type Type[SIZE];
};
#if FMT_USE_VARIADIC_TEMPLATES
template <typename Arg, typename... Args>
inline uint64_t make_type(const Arg &first, const Args & ... tail) {
return make_type(first) | (make_type(tail...) << 4);
}
template <typename Formatter>
inline void store_args(Arg *args) {
*args = Arg{0, Arg::NONE};
}
template <typename Formatter, typename T, typename... Args>
inline void store_args(Arg *args, const T &arg, const Args & ... tail) {
*args = MakeArg<Formatter>(arg);
store_args<Formatter>(args + 1, tail...);
}
template <typename Formatter>
inline void store_args(Value *) {}
template <typename Formatter, typename T, typename... Args>
inline void store_args(Value *args, const T &arg, const Args & ... tail) {
*args = MakeValue<Formatter>(arg);
store_args<Formatter>(args + 1, tail...);
}
template <typename Formatter, typename... Args>
ArgList make_arg_list(typename ArgArray<sizeof...(Args)>::Type array,
const Args & ... args) {
store_args<Formatter>(array, args...);
return ArgList(make_type(args...), array);
}
#else
struct ArgType {
uint64_t type;
@ -2011,18 +1997,16 @@ class FormatBuf : public std::basic_streambuf<Char> {
# define FMT_VARIADIC_VOID(func, arg_type) \
template <typename... Args> \
void func(arg_type arg0, const Args & ... args) { \
typename fmt::internal::ArgArray<sizeof...(Args)>::Type array; \
func(arg0, fmt::internal::make_arg_list< \
fmt::BasicFormatter<Char> >(array, args...)); \
fmt::internal::ArgArray<fmt::BasicFormatter<Char>, sizeof...(Args)> array{args...}; \
func(arg0, fmt::ArgList(fmt::internal::make_type(args...), array)); \
}
// Defines a variadic constructor.
# define FMT_VARIADIC_CTOR(ctor, func, arg0_type, arg1_type) \
template <typename... Args> \
ctor(arg0_type arg0, arg1_type arg1, const Args & ... args) { \
typename fmt::internal::ArgArray<sizeof...(Args)>::Type array; \
func(arg0, arg1, fmt::internal::make_arg_list< \
fmt::BasicFormatter<Char> >(array, args...)); \
fmt::internal::ArgArray<fmt::BasicFormatter<Char>, sizeof...(Args)> array{args...}; \
func(arg0, arg1, fmt::ArgList(fmt::internal::make_type(args...), array)); \
}
#else
@ -3242,10 +3226,9 @@ void arg(WStringRef, const internal::NamedArg<Char>&) FMT_DELETED_OR_UNDEFINED;
template <typename... Args> \
ReturnType func(FMT_FOR_EACH(FMT_ADD_ARG_NAME, __VA_ARGS__), \
const Args & ... args) { \
typename fmt::internal::ArgArray<sizeof...(Args)>::Type array; \
fmt::internal::ArgArray<fmt::BasicFormatter<Char>, sizeof...(Args)> array{args...}; \
call(FMT_FOR_EACH(FMT_GET_ARG_NAME, __VA_ARGS__), \
fmt::internal::make_arg_list< \
fmt::BasicFormatter<Char> >(array, args...)); \
fmt::ArgList(fmt::internal::make_type(args...), array)); \
}
#else
// Defines a wrapper for a function taking __VA_ARGS__ arguments