115 lines
2.2 KiB
C++
Executable File
115 lines
2.2 KiB
C++
Executable File
// file : odb/section.hxx
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// copyright : Copyright (c) 2009-2015 Code Synthesis Tools CC
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// license : GNU GPL v2; see accompanying LICENSE file
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#ifndef ODB_SECTION_HXX
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#define ODB_SECTION_HXX
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#include <odb/pre.hxx>
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#include <odb/transaction.hxx>
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#include <odb/details/export.hxx>
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namespace odb
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{
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class LIBODB_EXPORT section
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{
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public:
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// Load state.
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//
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bool
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loaded () const {return state_.loaded;}
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// Mark a loaded section as not loaded. This, for example, can be
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// useful if you don't want the section to be reloaded during the
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// object reload.
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//
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void
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unload ()
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{
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state_.loaded = 0;
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state_.changed = 0;
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state_.restore = 0;
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}
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// Change state.
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//
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bool
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changed () const {return state_.changed;}
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// Mark the section as changed.
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//
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void
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change ()
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{
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state_.changed = 1;
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state_.restore = 0;
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}
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// User data. 4 bits of custom state.
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//
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unsigned char
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user_data () const {return state_.user;}
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void
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user_data (unsigned char u) {state_.user = u;}
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public:
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section ()
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{
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state_.loaded = 0;
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state_.changed = 0;
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state_.armed = 0;
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state_.restore = 0;
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}
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~section ()
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{
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if (state_.armed)
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disarm ();
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}
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// Implementation details.
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//
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public:
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// Arm the callback and set the restore flag if transaction is not NULL.
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//
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void
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reset (bool l = false, bool c = false, transaction* t = 0) const
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{
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state_.loaded = l;
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state_.changed = c;
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if (t != 0 && !state_.armed)
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{
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t->callback_register (&transacion_callback,
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const_cast<section*> (this));
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state_.armed = 1;
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}
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state_.restore = (t != 0);
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}
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private:
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void
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disarm ();
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static void
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transacion_callback (unsigned short, void* key, unsigned long long);
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private:
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mutable struct
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{
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unsigned char loaded : 1;
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unsigned char changed : 1;
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unsigned char armed : 1; // Transaction callback is armed.
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unsigned char restore: 1; // Restore changed flag on rollback.
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unsigned char user : 4; // User data.
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} state_;
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};
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}
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#include <odb/post.hxx>
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#endif // ODB_SECTION_HXX
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