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author | Boris Kolpackov <boris@codesynthesis.com> | 2009-09-06 12:52:53 +0200 |
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committer | Boris Kolpackov <boris@codesynthesis.com> | 2009-09-06 12:52:53 +0200 |
commit | cb9ea47e7825b5073d4d645afb94f6326cb7cf4d (patch) | |
tree | 201c215b08df918924153a60520046c294438a6b /cutl/static-ptr.hxx |
Start the libcutl repository
Diffstat (limited to 'cutl/static-ptr.hxx')
-rw-r--r-- | cutl/static-ptr.hxx | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/cutl/static-ptr.hxx b/cutl/static-ptr.hxx new file mode 100644 index 0000000..12ecc1c --- /dev/null +++ b/cutl/static-ptr.hxx @@ -0,0 +1,75 @@ +// file : cutl/static-ptr.hxx +// author : Boris Kolpackov <boris@codesynthesis.com> +// copyright : Copyright (c) 2009 Code Synthesis Tools CC +// license : MIT; see accompanying LICENSE file + +#ifndef CUTL_STATIC_PTR_HXX +#define CUTL_STATIC_PTR_HXX + +#include <cstddef> // std::size_t + +namespace cutl +{ + // This class template implements Jerry Schwarz's static + // initialization technique commonly found in iostream + // implementations. + // + // The second template argument is used to make sure the + // instantiation of static_ptr is unique. + // + template <typename X, typename ID> + class static_ptr + { + public: + static_ptr () + { + if (count_ == 0) + x_ = new X; + + ++count_; + } + + ~static_ptr () + { + if (--count_ == 0) + delete x_; + } + + private: + static_ptr (static_ptr const&); + + static_ptr& + operator= (static_ptr const&); + + public: + X* + operator-> () const + { + return x_; + } + + X& + operator* () const + { + return *x_; + } + + X* + get () const + { + return x_; + } + + private: + static X* x_; + static std::size_t count_; + }; + + template <typename X, typename ID> + X* static_ptr<X, ID>::x_ = 0; + + template <typename X, typename ID> + std::size_t static_ptr<X, ID>::count_ = 0; +} + +#endif // CUTL_STATIC_PTR_HXX |