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Sprout/sprout/cwchar/wcsspn.hpp
2012-10-06 00:58:56 +09:00

26 lines
695 B
C++

#ifndef SPROUT_CWCHAR_WCSSPN_HPP
#define SPROUT_CWCHAR_XXX_HPP
#include <cstddef>
#include <sprout/config.hpp>
#include <sprout/cstring/strchr.hpp>
namespace sprout {
// Copyright (C) 2011 RiSK (sscrisk)
namespace detail {
inline SPROUT_CONSTEXPR std::size_t
wcsspn_impl(wchar_t const* s1, wchar_t const* s2, std::size_t n) {
return !*s1 || !sprout::wcschr(s2, *s1) ? n
: sprout::detail::wcsspn_impl(s1 + 1, s2, n + 1)
;
}
} // namespace detail
inline SPROUT_CONSTEXPR std::size_t
wcsspn(wchar_t const* s1, wchar_t const* s2) {
return sprout::detail::wcsspn_impl(s1, s2, 0);
}
} // namespace sprout
#endif // #ifndef SPROUT_CWCHAR_XXX_HPP