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127 lines
3.8 KiB
C++
127 lines
3.8 KiB
C++
/*
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* Copyright 2016 Two Blue Cubes Ltd. All rights reserved.
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*
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* Distributed under the Boost Software License, Version 1.0. (See accompanying
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* file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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*/
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#ifndef CATCH_STRINGREF_H_INCLUDED
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#define CATCH_STRINGREF_H_INCLUDED
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#include <cstddef>
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#include <string>
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#include <iosfwd>
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namespace Catch {
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class StringData;
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/// A non-owning string class (similar to the forthcoming std::string_view)
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/// Note that, because a StringRef may be a substring of another string,
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/// it may not be null terminated. c_str() must return a null terminated
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/// string, however, and so the StringRef will internally take ownership
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/// (taking a copy), if necessary. In theory this ownership is not externally
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/// visible - but it does mean (substring) StringRefs should not be shared between
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/// threads.
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class StringRef {
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public:
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using size_type = std::size_t;
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private:
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friend struct StringRefTestAccess;
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char const* m_start;
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size_type m_size;
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char* m_data = nullptr;
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void takeOwnership();
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static constexpr char const* const s_empty = "";
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public: // construction/ assignment
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StringRef() noexcept
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: StringRef( s_empty, 0 )
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{}
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StringRef( StringRef const& other ) noexcept
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: m_start( other.m_start ),
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m_size( other.m_size )
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{}
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StringRef( StringRef&& other ) noexcept
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: m_start( other.m_start ),
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m_size( other.m_size ),
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m_data( other.m_data )
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{
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other.m_data = nullptr;
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}
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StringRef( char const* rawChars ) noexcept;
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StringRef( char const* rawChars, size_type size ) noexcept
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: m_start( rawChars ),
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m_size( size )
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{}
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StringRef( std::string const& stdString ) noexcept
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: m_start( stdString.c_str() ),
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m_size( stdString.size() )
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{}
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~StringRef() noexcept {
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delete[] m_data;
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}
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auto operator = ( StringRef const &other ) noexcept -> StringRef& {
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delete[] m_data;
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m_data = nullptr;
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m_start = other.m_start;
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m_size = other.m_size;
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return *this;
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}
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operator std::string() const;
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void swap( StringRef& other ) noexcept;
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friend auto operator << (std::ostream& os, StringRef const& sr)->std::ostream&;
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public: // operators
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auto operator == ( StringRef const& other ) const noexcept -> bool;
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auto operator != ( StringRef const& other ) const noexcept -> bool;
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auto operator[] ( size_type index ) const noexcept -> char;
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public: // named queries
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auto empty() const noexcept -> bool {
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return m_size == 0;
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}
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auto size() const noexcept -> size_type {
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return m_size;
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}
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auto numberOfCharacters() const noexcept -> size_type;
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auto c_str() const -> char const*;
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public: // substrings and searches
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auto substr( size_type start, size_type size ) const noexcept -> StringRef;
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private: // ownership queries - may not be consistent between calls
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auto isOwned() const noexcept -> bool;
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auto isSubstring() const noexcept -> bool;
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auto data() const noexcept -> char const*;
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};
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auto operator + ( StringRef const& lhs, StringRef const& rhs ) -> std::string;
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auto operator + ( StringRef const& lhs, char const* rhs ) -> std::string;
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auto operator + ( char const* lhs, StringRef const& rhs ) -> std::string;
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inline auto operator "" _sr( char const* rawChars, std::size_t size ) noexcept -> StringRef {
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return StringRef( rawChars, size );
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}
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} // namespace Catch
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#endif // CATCH_STRINGREF_H_INCLUDED
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