89 lines
4.0 KiB
C++
89 lines
4.0 KiB
C++
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#ifndef _C4_STD_VECTOR_HPP_
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#define _C4_STD_VECTOR_HPP_
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/** @file vector.hpp provides conversion and comparison facilities
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* from/between std::vector<char> to c4::substr and c4::csubstr.
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* @todo add to_span() and friends
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*/
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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 <vector>
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namespace c4 {
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//-----------------------------------------------------------------------------
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/** get a substr (writeable string view) of an existing std::vector<char> */
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template<class Alloc>
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c4::substr to_substr(std::vector<char, Alloc> &vec)
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{
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char *data = vec.empty() ? nullptr : vec.data(); // data() may or may not return a null pointer.
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return c4::substr(data, vec.size());
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}
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/** get a csubstr (read-only string) view of an existing std::vector<char> */
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template<class Alloc>
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c4::csubstr to_csubstr(std::vector<char, Alloc> const& vec)
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{
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const char *data = vec.empty() ? nullptr : vec.data(); // data() may or may not return a null pointer.
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return c4::csubstr(data, vec.size());
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}
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//-----------------------------------------------------------------------------
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// comparisons between substrings and std::vector<char>
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template<class Alloc> C4_ALWAYS_INLINE bool operator!= (c4::csubstr ss, std::vector<char, Alloc> const& s) { return ss != to_csubstr(s); }
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template<class Alloc> C4_ALWAYS_INLINE bool operator== (c4::csubstr ss, std::vector<char, Alloc> const& s) { return ss == to_csubstr(s); }
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template<class Alloc> C4_ALWAYS_INLINE bool operator>= (c4::csubstr ss, std::vector<char, Alloc> const& s) { return ss >= to_csubstr(s); }
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template<class Alloc> C4_ALWAYS_INLINE bool operator> (c4::csubstr ss, std::vector<char, Alloc> const& s) { return ss > to_csubstr(s); }
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template<class Alloc> C4_ALWAYS_INLINE bool operator<= (c4::csubstr ss, std::vector<char, Alloc> const& s) { return ss <= to_csubstr(s); }
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template<class Alloc> C4_ALWAYS_INLINE bool operator< (c4::csubstr ss, std::vector<char, Alloc> const& s) { return ss < to_csubstr(s); }
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template<class Alloc> C4_ALWAYS_INLINE bool operator!= (std::vector<char, Alloc> const& s, c4::csubstr ss) { return ss != to_csubstr(s); }
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template<class Alloc> C4_ALWAYS_INLINE bool operator== (std::vector<char, Alloc> const& s, c4::csubstr ss) { return ss == to_csubstr(s); }
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template<class Alloc> C4_ALWAYS_INLINE bool operator>= (std::vector<char, Alloc> const& s, c4::csubstr ss) { return ss <= to_csubstr(s); }
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template<class Alloc> C4_ALWAYS_INLINE bool operator> (std::vector<char, Alloc> const& s, c4::csubstr ss) { return ss < to_csubstr(s); }
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template<class Alloc> C4_ALWAYS_INLINE bool operator<= (std::vector<char, Alloc> const& s, c4::csubstr ss) { return ss >= to_csubstr(s); }
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template<class Alloc> C4_ALWAYS_INLINE bool operator< (std::vector<char, Alloc> const& s, c4::csubstr ss) { return ss > to_csubstr(s); }
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//-----------------------------------------------------------------------------
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/** copy a std::vector<char> to a writeable string view */
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template<class Alloc>
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inline size_t to_chars(c4::substr buf, std::vector<char, Alloc> const& s)
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{
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C4_ASSERT(!buf.overlaps(to_csubstr(s)));
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size_t len = buf.len < s.size() ? buf.len : s.size();
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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 > 0)
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{
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memcpy(buf.str, s.data(), len);
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}
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return s.size(); // return the number of needed chars
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}
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/** copy a string view to an existing std::vector<char> */
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template<class Alloc>
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inline bool from_chars(c4::csubstr buf, std::vector<char, Alloc> * s)
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{
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s->resize(buf.len);
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C4_ASSERT(!buf.overlaps(to_csubstr(*s)));
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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(buf.len > 0)
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{
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memcpy(&(*s)[0], buf.str, buf.len);
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}
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return true;
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}
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} // namespace c4
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#endif // _C4_STD_VECTOR_HPP_
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