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98 lines
3.9 KiB
C++
98 lines
3.9 KiB
C++
#ifndef _C4_STD_STRING_HPP_
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#define _C4_STD_STRING_HPP_
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/** @file string.hpp */
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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>
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namespace c4 {
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//-----------------------------------------------------------------------------
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/** get a writeable view to an existing std::string.
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* When the string is empty, the returned view will be pointing
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* at the character with value '\0', but the size will be zero.
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* @see https://en.cppreference.com/w/cpp/string/basic_string/operator_at
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*/
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C4_ALWAYS_INLINE c4::substr to_substr(std::string &s) noexcept
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{
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#if C4_CPP < 11
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#error this function will have undefined behavior
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#endif
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// since c++11 it is legal to call s[s.size()].
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return c4::substr(&s[0], s.size());
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}
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/** get a readonly view to an existing std::string.
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* When the string is empty, the returned view will be pointing
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* at the character with value '\0', but the size will be zero.
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* @see https://en.cppreference.com/w/cpp/string/basic_string/operator_at
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*/
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C4_ALWAYS_INLINE c4::csubstr to_csubstr(std::string const& s) noexcept
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{
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#if C4_CPP < 11
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#error this function will have undefined behavior
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#endif
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// since c++11 it is legal to call s[s.size()].
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return c4::csubstr(&s[0], s.size());
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}
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//-----------------------------------------------------------------------------
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C4_ALWAYS_INLINE bool operator== (c4::csubstr ss, std::string const& s) { return ss.compare(to_csubstr(s)) == 0; }
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C4_ALWAYS_INLINE bool operator!= (c4::csubstr ss, std::string const& s) { return ss.compare(to_csubstr(s)) != 0; }
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C4_ALWAYS_INLINE bool operator>= (c4::csubstr ss, std::string const& s) { return ss.compare(to_csubstr(s)) >= 0; }
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C4_ALWAYS_INLINE bool operator> (c4::csubstr ss, std::string const& s) { return ss.compare(to_csubstr(s)) > 0; }
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C4_ALWAYS_INLINE bool operator<= (c4::csubstr ss, std::string const& s) { return ss.compare(to_csubstr(s)) <= 0; }
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C4_ALWAYS_INLINE bool operator< (c4::csubstr ss, std::string const& s) { return ss.compare(to_csubstr(s)) < 0; }
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C4_ALWAYS_INLINE bool operator== (std::string const& s, c4::csubstr ss) { return ss.compare(to_csubstr(s)) == 0; }
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C4_ALWAYS_INLINE bool operator!= (std::string const& s, c4::csubstr ss) { return ss.compare(to_csubstr(s)) != 0; }
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C4_ALWAYS_INLINE bool operator>= (std::string const& s, c4::csubstr ss) { return ss.compare(to_csubstr(s)) <= 0; }
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C4_ALWAYS_INLINE bool operator> (std::string const& s, c4::csubstr ss) { return ss.compare(to_csubstr(s)) < 0; }
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C4_ALWAYS_INLINE bool operator<= (std::string const& s, c4::csubstr ss) { return ss.compare(to_csubstr(s)) >= 0; }
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C4_ALWAYS_INLINE bool operator< (std::string const& s, c4::csubstr ss) { return ss.compare(to_csubstr(s)) > 0; }
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//-----------------------------------------------------------------------------
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/** copy an std::string to a writeable string view */
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inline size_t to_chars(c4::substr buf, std::string 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)
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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 s.size(); // return the number of needed chars
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}
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/** copy a string view to an existing std::string */
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inline bool from_chars(c4::csubstr buf, std::string * 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)
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{
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C4_ASSERT(buf.str != nullptr);
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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_STRING_HPP_
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