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72 lines
2.8 KiB
C++
72 lines
2.8 KiB
C++
#ifndef _C4_STD_STRING_VIEW_HPP_
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#define _C4_STD_STRING_VIEW_HPP_
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/** @file string_view.hpp */
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#ifndef C4CORE_SINGLE_HEADER
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#include "c4/language.hpp"
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#endif
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#if (C4_CPP >= 17 && defined(__cpp_lib_string_view))
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#ifndef C4CORE_SINGLE_HEADER
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#include "c4/substr.hpp"
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#endif
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#include <string_view>
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namespace c4 {
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//-----------------------------------------------------------------------------
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/** create a csubstr from an existing std::string_view. */
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C4_ALWAYS_INLINE c4::csubstr to_csubstr(std::string_view s) noexcept
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{
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return c4::csubstr(s.data(), s.size());
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}
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//-----------------------------------------------------------------------------
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C4_ALWAYS_INLINE bool operator== (c4::csubstr ss, std::string_view s) { return ss.compare(s.data(), s.size()) == 0; }
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C4_ALWAYS_INLINE bool operator!= (c4::csubstr ss, std::string_view s) { return ss.compare(s.data(), s.size()) != 0; }
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C4_ALWAYS_INLINE bool operator>= (c4::csubstr ss, std::string_view s) { return ss.compare(s.data(), s.size()) >= 0; }
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C4_ALWAYS_INLINE bool operator> (c4::csubstr ss, std::string_view s) { return ss.compare(s.data(), s.size()) > 0; }
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C4_ALWAYS_INLINE bool operator<= (c4::csubstr ss, std::string_view s) { return ss.compare(s.data(), s.size()) <= 0; }
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C4_ALWAYS_INLINE bool operator< (c4::csubstr ss, std::string_view s) { return ss.compare(s.data(), s.size()) < 0; }
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C4_ALWAYS_INLINE bool operator== (std::string_view s, c4::csubstr ss) { return ss.compare(s.data(), s.size()) == 0; }
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C4_ALWAYS_INLINE bool operator!= (std::string_view s, c4::csubstr ss) { return ss.compare(s.data(), s.size()) != 0; }
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C4_ALWAYS_INLINE bool operator<= (std::string_view s, c4::csubstr ss) { return ss.compare(s.data(), s.size()) >= 0; }
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C4_ALWAYS_INLINE bool operator< (std::string_view s, c4::csubstr ss) { return ss.compare(s.data(), s.size()) > 0; }
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C4_ALWAYS_INLINE bool operator>= (std::string_view s, c4::csubstr ss) { return ss.compare(s.data(), s.size()) <= 0; }
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C4_ALWAYS_INLINE bool operator> (std::string_view s, c4::csubstr ss) { return ss.compare(s.data(), s.size()) < 0; }
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//-----------------------------------------------------------------------------
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/** copy an std::string_view to a writeable substr */
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inline size_t to_chars(c4::substr buf, std::string_view s)
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{
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C4_ASSERT(!buf.overlaps(to_csubstr(s)));
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size_t sz = s.size();
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size_t len = buf.len < sz ? buf.len : sz;
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// calling memcpy with null strings is undefined behavior
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// and will wreak havoc in calling code's branches.
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// see https://github.com/biojppm/rapidyaml/pull/264#issuecomment-1262133637
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if(len)
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{
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C4_ASSERT(s.data() != nullptr);
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C4_ASSERT(buf.str != nullptr);
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memcpy(buf.str, s.data(), len);
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}
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return sz; // return the number of needed chars
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}
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} // namespace c4
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#endif // C4_STRING_VIEW_AVAILABLE
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#endif // _C4_STD_STRING_VIEW_HPP_
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