static_object.hpp
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/*
Copyright (c) 2014, Randolph Voorhies, Shane Grant
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#ifndef CEREAL_DETAILS_STATIC_OBJECT_HPP_
#define CEREAL_DETAILS_STATIC_OBJECT_HPP_
#include "cereal/macros.hpp"
#if CEREAL_THREAD_SAFE
#include <mutex>
#endif
#if defined(_MSC_VER) && !defined(__clang__)
# define CEREAL_DLL_EXPORT __declspec(dllexport)
# define CEREAL_USED
#else // clang or gcc
# define CEREAL_DLL_EXPORT __attribute__ ((visibility("default")))
# define CEREAL_USED __attribute__ ((__used__))
#endif
namespace cereal
{
namespace detail
{
template <class T>
class CEREAL_DLL_EXPORT StaticObject
{
private:
static T & create()
{
static T t;
(void)instance;
return t;
}
StaticObject( StaticObject const & /*other*/ ) {}
public:
static T & getInstance()
{
return create();
}
class LockGuard
{
#if CEREAL_THREAD_SAFE
public:
LockGuard(std::mutex & m) : lock(m) {}
private:
std::unique_lock<std::mutex> lock;
#else
public:
LockGuard() = default;
LockGuard(LockGuard const &) = default; // prevents implicit copy ctor warning
~LockGuard() CEREAL_NOEXCEPT {} // prevents variable not used
#endif
};
static LockGuard lock()
{
#if CEREAL_THREAD_SAFE
static std::mutex instanceMutex;
return LockGuard{instanceMutex};
#else
return LockGuard{};
#endif
}
private:
static T & instance;
};
template <class T> T & StaticObject<T>::instance = StaticObject<T>::create();
} // namespace detail
} // namespace cereal
#endif // CEREAL_DETAILS_STATIC_OBJECT_HPP_
cereal::detail::StaticObject::LockGuard
A class that acts like std::lock_guard.
Definition: static_object.hpp:88
macros.hpp
Preprocessor macros that can customise the cereal library.
CEREAL_DLL_EXPORT
#define CEREAL_DLL_EXPORT
Prevent link optimization from removing non-referenced static objects.
Definition: static_object.hpp:51
cereal::detail::StaticObject
A static, pre-execution object.
Definition: static_object.hpp:67
cereal::detail::StaticObject::lock
static LockGuard lock()
Attempts to lock this static object for the current scope.
Definition: static_object.hpp:110
CEREAL_NOEXCEPT
#define CEREAL_NOEXCEPT
Defines the CEREAL_NOEXCEPT macro to use instead of noexcept.
Definition: macros.hpp:130