43 lines
809 B
C++
43 lines
809 B
C++
#ifndef _library__globalwrap__hpp__included__
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#define _library__globalwrap__hpp__included__
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#include <iostream>
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/**
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* Wrapper for glboal/module-local objects accessable in global ctor context.
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*/
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template<class T>
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class globalwrap
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{
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public:
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/**
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* Ctor, forces the object to be constructed (to avoid races).
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*/
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globalwrap() throw(std::bad_alloc)
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{
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(*this)();
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}
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/**
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* Get the wrapped object.
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*
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* returns: The wrapped object.
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* throws std::bad_alloc: Not enough memory.
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*/
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T& operator()() throw(std::bad_alloc)
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{
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if(!storage) {
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if(!state) //State initializes to 0.
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state = 1;
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else if(state == 1)
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std::cerr << "Warning: Recursive use of globalwrap<T>." << std::endl;
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storage = new T();
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state = 2;
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}
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return *storage;
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}
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private:
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T* storage;
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unsigned state;
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};
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#endif
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