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25 lines
708 B
C++
25 lines
708 B
C++
#ifndef SPROUT_CSTRING_STRSPN_HPP
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#define SPROUT_CSTRING_XXX_HPP
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#include <cstddef>
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#include <sprout/config.hpp>
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#include <sprout/cstring/strchr.hpp>
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namespace sprout {
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// Copyright (C) 2011 RiSK (sscrisk)
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namespace detail {
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inline SPROUT_CONSTEXPR std::size_t strspn_impl(char const* s1, char const* s2, std::size_t n) {
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return !*s1 || !sprout::strchr(s2, *s1) ? n
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: sprout::detail::strspn_impl(s1 + 1, s2, n + 1)
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;
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}
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} // namespace detail
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// 7.21.5.6 strspn ŠÖ<C5A0>”
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inline SPROUT_CONSTEXPR std::size_t strspn(char const* s1, char const* s2) {
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return sprout::detail::strspn_impl(s1, s2, 0);
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}
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} // namespace sprout
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#endif // #ifndef SPROUT_CSTRING_XXX_HPP
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