mirror of
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90 lines
2.5 KiB
C++
90 lines
2.5 KiB
C++
/*=============================================================================
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Copyright (c) 2011-2017 Bolero MURAKAMI
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https://github.com/bolero-MURAKAMI/Sprout
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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=============================================================================*/
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#ifndef TESTSPR_SINGLETON_HPP
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#define TESTSPR_SINGLETON_HPP
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#include <sprout/config.hpp>
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#include <sprout/utility/noncopyable.hpp>
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#include <sprout/assert.hpp>
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namespace testspr {
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//
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// singleton_module
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//
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class singleton_module
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: public sprout::noncopyable
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{
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private:
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static inline SPROUT_NON_CONSTEXPR bool& get_lock() {
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static bool lock = false;
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return lock;
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}
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public:
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static inline SPROUT_NON_CONSTEXPR void lock() {
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get_lock() = true;
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}
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static inline SPROUT_NON_CONSTEXPR void unlock() {
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get_lock() = false;
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}
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static inline SPROUT_NON_CONSTEXPR bool is_locked() {
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return get_lock();
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}
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};
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namespace detail {
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template<typename T>
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class singleton_wrapper
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: public T
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{
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public:
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static bool m_is_destroyed;
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public:
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~singleton_wrapper() {
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m_is_destroyed = true;
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}
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};
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template<typename T>
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bool testspr::detail::singleton_wrapper<T>::m_is_destroyed = false;
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} // namespace detail
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//
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// singleton
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//
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template<typename T>
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class singleton
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: public testspr::singleton_module
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{
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public:
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typedef T instance_type;
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private:
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static instance_type& instance;
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private:
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static inline SPROUT_NON_CONSTEXPR void use(const instance_type&) {}
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static inline SPROUT_NON_CONSTEXPR instance_type& get_instance() {
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static detail::singleton_wrapper<instance_type> t;
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SPROUT_ASSERT(!testspr::detail::singleton_wrapper<instance_type>::m_is_destroyed);
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use(instance);
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return static_cast<instance_type&>(t);
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}
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public:
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static inline SPROUT_NON_CONSTEXPR instance_type& get_mutable_instance() {
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SPROUT_ASSERT(!is_locked());
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return get_instance();
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}
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static inline SPROUT_NON_CONSTEXPR instance_type const& get_const_instance() {
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return get_instance();
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}
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static inline SPROUT_NON_CONSTEXPR bool is_destroyed() {
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return testspr::detail::singleton_wrapper<instance_type>::m_is_destroyed;
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}
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};
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template<typename T>
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T& singleton<T>::instance = testspr::singleton<T>::get_instance();
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} // namespace testspr
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#endif // #ifndef TESTSPR_SINGLETON_HPP
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