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New defer

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This commit is contained in:
Brian Fiete 2019-10-15 12:28:35 -07:00
parent c8ca66ec5c
commit 578b886526
1 changed files with 13 additions and 33 deletions
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46
BeefySysLib/Common.h
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@ -253,42 +253,22 @@ struct RemoveTypePointer<T*>
};
#ifndef BF_SMALL
struct OnScopeExit
{
std::function<void()> mFunc;
OnScopeExit(std::function<void()> func) : mFunc(func)
{
}
~OnScopeExit()
{
mFunc();
}
template <typename F>
struct BF_Defer {
F f;
BF_Defer(F f) : f(f) {}
~BF_Defer() { f(); }
};
#define CONCAT_INTERNAL(x,y) x##y
#define CONCAT(x,y) CONCAT_INTERNAL(x,y)
template <typename F>
BF_Defer<F> BF_defer_func(F f) {
return BF_Defer<F>(f);
}
template<typename T>
struct ExitScope
{
T lambda;
ExitScope(T lambda) :lambda(lambda) {}
~ExitScope() { lambda(); }
ExitScope(const ExitScope&);
private:
ExitScope & operator =(const ExitScope&);
};
class ExitScopeHelp
{
public:
template<typename T>
ExitScope<T> operator+(T t) { return t; }
};
#define defer const auto& CONCAT(defer__, __LINE__) = ExitScopeHelp() + [&]()
#define DEFER_1(x, y) x##y
#define DEFER_2(x, y) DEFER_1(x, y)
#define DEFER_3(x) DEFER_2(x, __COUNTER__)
#define defer(code) auto DEFER_3(_defer_) = BF_defer_func([&](){code;})
#endif //BF_SMALL
NS_BF_END