93 lines
2.4 KiB
C++
93 lines
2.4 KiB
C++
/**********************************************************************
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Audacity: A Digital Audio Editor
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wxFileNameWrapper.h
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Paul Licameli
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**********************************************************************/
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#ifndef __AUDACITY_WXFILENAMEWRAPPER__
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#define __AUDACITY_WXFILENAMEWRAPPER__
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class wxArrayString;
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#include <wx/filename.h> // to inherit
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// The wxFileName does not have a move constructor.
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// So add one to it, so that it passes around by value more quickly.
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class wxFileNameWrapper : public wxFileName
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{
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public:
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using wxFileName::wxFileName;
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explicit
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wxFileNameWrapper(const wxFileName &that)
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: wxFileName(that)
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{}
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wxFileNameWrapper() = default;
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wxFileNameWrapper(const wxFileNameWrapper &that) = default;
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wxFileNameWrapper &operator= (const wxFileNameWrapper &that) = default;
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void swap(wxFileNameWrapper &that)
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{
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if (this != &that) {
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#if 0
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// Awful hack number 1 makes gcc 5 choke
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enum : size_t { Size = sizeof(*this) };
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// Do it bitwise.
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// std::aligned_storage<Size>::type buffer;
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char buffer[Size];
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memcpy(&buffer, this, Size);
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memcpy(this, &that, Size);
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memcpy(&that, &buffer, Size);
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#else
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// Awful hack number 2 relies on knowing the class layout
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// This is the less evil one but watch out for redefinition of the base class
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struct Contents
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{
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void swap(Contents &that) {
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m_volume.swap(that.m_volume);
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m_dirs.swap(that.m_dirs);
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m_name.swap(that.m_name);
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m_ext.swap(that.m_ext);
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std::swap(m_relative, that.m_relative);
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std::swap(m_hasExt, that.m_hasExt);
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std::swap(m_dontFollowLinks, that.m_dontFollowLinks);
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};
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wxString m_volume;
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wxArrayString m_dirs;
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wxString m_name, m_ext;
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bool m_relative;
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bool m_hasExt;
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bool m_dontFollowLinks;
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};
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reinterpret_cast<Contents*>(this)->swap
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(*reinterpret_cast<Contents*>(&that));
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#endif
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}
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}
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// Define move copy and assignment in terms of swap
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wxFileNameWrapper(wxFileNameWrapper &&that)
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{
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swap(that);
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}
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wxFileNameWrapper &operator= (wxFileNameWrapper &&that)
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{
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if (this != &that) {
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Clear();
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swap(that);
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}
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return *this;
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}
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};
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#endif
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