105 lines
3.4 KiB
C++
105 lines
3.4 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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#include <cassert>
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namespace Catch {
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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.
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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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using const_iterator = const char*;
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private:
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static constexpr char const* const s_empty = "";
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char const* m_start = s_empty;
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size_type m_size = 0;
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public: // construction
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constexpr StringRef() noexcept = default;
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StringRef( char const* rawChars ) noexcept;
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constexpr 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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explicit operator std::string() const {
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return std::string(m_start, m_size);
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}
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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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return !(*this == other);
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}
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auto operator[] ( size_type index ) const noexcept -> char {
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assert(index < m_size);
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return m_start[index];
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}
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public: // named queries
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constexpr auto empty() const noexcept -> bool {
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return m_size == 0;
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}
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constexpr auto size() const noexcept -> size_type {
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return m_size;
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}
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// Returns the current start pointer. If the StringRef is not
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// null-terminated, throws std::domain_exception
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auto c_str() const -> char const*;
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public: // substrings and searches
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// Returns a substring of [start, start + length).
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// If start + length > size(), then the substring is [start, size()).
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// If start > size(), then the substring is empty.
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auto substr( size_type start, size_type length ) const noexcept -> StringRef;
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// Returns the current start pointer. May not be null-terminated.
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auto data() const noexcept -> char const*;
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constexpr auto isNullTerminated() const noexcept -> bool {
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return m_start[m_size] == '\0';
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}
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public: // iterators
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constexpr const_iterator begin() const { return m_start; }
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constexpr const_iterator end() const { return m_start + m_size; }
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};
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auto operator += ( std::string& lhs, StringRef const& sr ) -> std::string&;
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auto operator << ( std::ostream& os, StringRef const& sr ) -> std::ostream&;
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constexpr 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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constexpr auto operator "" _catch_sr( char const* rawChars, std::size_t size ) noexcept -> Catch::StringRef {
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return Catch::StringRef( rawChars, size );
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}
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#endif // CATCH_STRINGREF_H_INCLUDED
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