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Replace template recursion with array initialization

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This commit is contained in:
Dean Moldovan 2015-12-12 17:12:29 +01:00
parent a721319e3a
commit b098306839
1 changed files with 28 additions and 44 deletions
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72
format.h
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@ -1923,16 +1923,23 @@ inline uint64_t make_type(const T &arg) {
return MakeValue< BasicFormatter<char> >::type(arg);
}
template <unsigned N>
struct ArgArray {
// Computes the argument array size by adding 1 to N, which is the number of
// arguments, if N is zero, because array of zero size is invalid, or if N
// is greater than ArgList::MAX_PACKED_ARGS to accommodate for an extra
// argument that marks the end of the list.
enum { SIZE = N + (N == 0 || N >= ArgList::MAX_PACKED_ARGS ? 1 : 0) };
template <unsigned N, bool/*IsPacked*/= (N < ArgList::MAX_PACKED_ARGS)>
struct ArgArray;
typedef typename Conditional<
(N < ArgList::MAX_PACKED_ARGS), Value, Arg>::type Type[SIZE];
template <unsigned N>
struct ArgArray<N, true/*IsPacked*/> {
typedef Value Type[N > 0 ? N : 1];
template <typename Formatter, typename T>
static Value make(const T &value) { return MakeValue<Formatter>(value); }
};
template <unsigned N>
struct ArgArray<N, false/*IsPacked*/> {
typedef Arg Type[N + 1]; // +1 for the list end Arg::NONE
template <typename Formatter, typename T>
static Arg make(const T &value) { return MakeArg<Formatter>(value); }
};
#if FMT_USE_VARIADIC_TEMPLATES
@ -1941,32 +1948,6 @@ 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 = MakeArg<Formatter>();
}
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 {
@ -2034,18 +2015,20 @@ 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...)); \
typedef fmt::internal::ArgArray<sizeof...(Args)> ArgArray; \
typename ArgArray::Type array{ \
ArgArray::template make<fmt::BasicFormatter<Char> >(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...)); \
typedef fmt::internal::ArgArray<sizeof...(Args)> ArgArray; \
typename ArgArray::Type array{ \
ArgArray::template make<fmt::BasicFormatter<Char> >(args)...}; \
func(arg0, arg1, fmt::ArgList(fmt::internal::make_type(args...), array)); \
}
#else
@ -3264,10 +3247,11 @@ 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; \
typedef fmt::internal::ArgArray<sizeof...(Args)> ArgArray; \
typename ArgArray::Type array{ \
ArgArray::template make<fmt::BasicFormatter<Char> >(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