56 lines
2.2 KiB
C++
56 lines
2.2 KiB
C++
/* @file String.hpp
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*
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* author: Roland Conybeare, Aug 2025
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*/
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#include "xo/alloc/IAlloc.hpp"
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#include "xo/alloc/Object.hpp"
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namespace xo {
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namespace obj {
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class String : public Object {
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public:
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enum class owner { unique, shared };
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/** donwcast from @p x iff x is actually a String. Otherwise nullptr **/
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static gp<String> from(gp<Object> x);
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/** create shared string @p s, using allocator @ref Object::mm **/
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static gp<String> share(const char * s);
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/** create copy of string @p s, using allocator @ref Object::mm **/
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static gp<String> copy(const char * s);
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/** create copy of string @p s, using allocator @p mm **/
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static gp<String> copy(gc::IAlloc * mm, const char * s);
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/** create empty string with @p z bytes of string space **/
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static gp<String> allocate(std::size_t z);
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/** create string containing contents of @p s1 follwed by contents of @p s2 **/
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static gp<String> append(gp<String> s1, gp<String> s2);
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const char * c_str() const { return chars_; }
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std::size_t length() const;
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// inherited from Object..
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virtual TaggedPtr self_tp() const final override;
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virtual std::size_t _shallow_size() const final override;
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virtual Object * _shallow_copy() const final override;
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virtual std::size_t _forward_children() final override;
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private:
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String(owner owner, std::size_t z, char * s);
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/** create instance, copying string contents (when @p copy_flag is true) using allocator @p mm **/
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String(gc::IAlloc * mm, owner owner, std::size_t z, char * s);
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private:
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/** true iff storage in @ref chars_ is owned by this String.
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**/
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owner owner_ = owner::shared;
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/** length of @ref chars_ in bytes (storage allocated, not necessarily string length) **/
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std::size_t z_chars_ = 0;
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/** string contents. always null-terminated **/
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char * chars_ = nullptr;
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};
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} /*namespace obj*/
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} /*namespace xo*/
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/* end String.hpp */
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