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73 lines
2.7 KiB
C++
73 lines
2.7 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_STRINGBUILDER_H_INCLUDED
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#define CATCH_STRINGBUILDER_H_INCLUDED
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#include "catch_stringref.h"
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namespace Catch {
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class String;
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class StringData;
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/// A mutable container for string data
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/// Use to build up strings before transferring to an immutable String.
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/// Construct the String using the rvalue reference constructor (which
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/// will usually involve std::move-ing the StringBuilder). This will transfer
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/// The underlying buffer without any extra allocations or ref counts.
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class StringBuilder {
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friend class String;
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public:
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using size_type = unsigned long;
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StringBuilder();
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StringBuilder( size_type initialCapacity );
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StringBuilder( StringRef const& str, size_type initialCapacity );
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StringBuilder( StringBuilder const& other, size_type initialCapacity );
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StringBuilder( StringBuilder&& other ) noexcept;
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StringBuilder( String&& other );
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StringBuilder( String const& other );
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~StringBuilder() noexcept;
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void swap( StringBuilder& other ) noexcept;
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auto size() const noexcept -> size_type;
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auto capacity() const noexcept -> size_type;
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/// Grows the buffer to exactly the capacity requested, or
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/// does nothing if it is already at least as big
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void reserve(size_type capacity);
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/// Grows the buffer exponentially (from a baseline of 32 bytes)
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/// until it is at least as large as the requested capacity -
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/// or does nothing if already large enough
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void reserveExponential(size_type capacity);
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/// Writes the string at the current insertion point then moves
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/// the insertion point forward by the string length.
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/// If the buffer needs to grow to accomodate the string it does so
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/// using the exponential strategy
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void append( StringRef const& str );
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friend auto operator << ( StringBuilder& sb, StringRef sr ) -> StringBuilder&;
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friend auto operator << ( StringBuilder&& sb, StringRef sr ) -> StringBuilder&&;
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/// Writes the contents of the string ref into the buffer at
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/// the indexed location.
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/// The bounds are not checked! Use append() to just add to the
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/// end of the buffer, extending it if the capacity is not enough.
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void writeTo( size_type index, StringRef const& str );
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private:
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size_type m_size = 0;
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StringData* m_data;
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};
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} // namespace Catch
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#endif // CATCH_STRINGBUILDER_H_INCLUDED
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