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feat: rewrite parse()

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Sonullx Liu
2020-09-08 15:33:41 +08:00
parent f31421e28d
commit 2456b3dff9
1 changed files with 14 additions and 25 deletions
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39
benchmark/util/args.h
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@@ -46,49 +46,38 @@ namespace details
return true;
}
template <typename Arg>
inline bool extract_impl(size_t todo, int & index, bool & r, char **& p, Arg & arg)
template <typename ARG>
inline int parse_one(bool & flag, char **& p, char ** end, ARG & arg)
{
if (!r || index >= todo)
if (flag && (flag = p < end) && (flag = extract(*p, arg)))
{
return false;
p++;
}
r = extract(*p, arg);
if (!r)
{
return false;
}
index++;
p++;
return true;
return 0;
}
template <typename ... ARGS>
inline int parse(size_t todo, char ** p, ARGS & ... args)
inline size_t parse_all(char ** begin, char ** end, ARGS & ... args)
{
int index = 0;
bool r = true;
(void)std::initializer_list<int>{(extract_impl(todo, index, r, p, args), 0)...};
return index;
bool flag = true;
char ** p = begin;
static_cast<void>(std::initializer_list<int>{parse_one(flag, p, end, args) ...});
return p - begin;
}
template <typename ... ARGS>
inline int parse_args(int & argc, char ** argv, ARGS & ... args)
inline size_t parse_args(int & argc, char ** argv, ARGS & ... args)
{
if (argc <= 1)
{
return 0;
}
int length = argc - 1;
size_t length = argc - 1;
char ** begin = argv + 1;
char ** end = begin + length;
int done = parse(length, begin, args ...);
size_t done = parse_all(begin, end, args ...);
std::rotate(begin, begin + done, end);
std::reverse(end - done, end);
@@ -98,7 +87,7 @@ namespace details
}
template <typename ... ARGS>
inline static int parse_args(int & argc, char ** argv, ARGS & ... args)
inline static size_t parse_args(int & argc, char ** argv, ARGS & ... args)
{
return details::parse_args(argc, argv, args ...);
}