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Reduce compiled code size when using variadic templates

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This commit is contained in:
vitaut 2015-03-25 08:29:55 -07:00
parent 66915785dd
commit 2ba3988da3
1 changed files with 12 additions and 1 deletions
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13
format.h
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@ -2608,6 +2608,15 @@ inline void set_types(Arg *args, const T &arg, const Args & ... tail) {
args->type = static_cast<Arg::Type>(MakeArg<T>::type(arg));
set_types(args + 1, tail...);
}
// 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.
template <unsigned N>
struct ArgArraySize {
enum { VALUE = N + (N == 0 || N > ArgList::MAX_PACKED_ARGS ? 1 : 0) };
};
}
}
@ -2616,7 +2625,9 @@ inline void set_types(Arg *args, const T &arg, const Args & ... tail) {
ReturnType func(FMT_FOR_EACH(FMT_ADD_ARG_NAME, __VA_ARGS__), \
const Args & ... args) { \
using fmt::internal::Arg; \
Arg array[sizeof...(Args) + 1] = {fmt::internal::MakeArg<Char>(args)...}; \
Arg array[fmt::internal::ArgArraySize<sizeof...(Args)>::VALUE] = { \
fmt::internal::MakeArg<Char>(args)... \
}; \
if (sizeof...(Args) > fmt::ArgList::MAX_PACKED_ARGS) { \
set_types(array, args...); \
array[sizeof...(Args)].type = Arg::NONE; \