55 lines
1.5 KiB
C++
55 lines
1.5 KiB
C++
#pragma once
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namespace unwinder { namespace detail {
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template<typename Function>
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class unwinder
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{
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public:
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~unwinder() noexcept
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{
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if (!!function)
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{
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(*function)();
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}
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}
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explicit unwinder(Function* functionArg)
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: function(functionArg)
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{
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}
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void dismiss()
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{
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function = nullptr;
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}
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unwinder& operator=(nullptr_t) {
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dismiss();
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return *this;
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}
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private:
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unwinder();
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unwinder(const unwinder&);
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unwinder& operator=(const unwinder&);
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Function* function;
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};
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} }
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#define UNWIND_MAKE_IDENTIFIER_EXPLICIT_PASTER(Prefix, Suffix) Prefix ## Suffix
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#define UNWIND_MAKE_IDENTIFIER_EXPLICIT(Prefix, Suffix) UNWIND_MAKE_IDENTIFIER_EXPLICIT_PASTER(Prefix, Suffix)
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#define UNWIND_MAKE_IDENTIFIER(Prefix) UNWIND_MAKE_IDENTIFIER_EXPLICIT(Prefix, __LINE__)
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#define ON_UNWIND(Name, Function) \
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ON_UNWIND_EXPLICIT(uwfunc_ ## Name, Name, Function)
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#define ON_UNWIND_AUTO(Function) \
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ON_UNWIND_EXPLICIT(UNWIND_MAKE_IDENTIFIER(uwfunc_), UNWIND_MAKE_IDENTIFIER(unwind_), Function)
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#define ON_UNWIND_EXPLICIT(FunctionName, UnwinderName, Function) \
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auto FunctionName = (Function); \
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::unwinder::detail::unwinder<decltype(FunctionName)> UnwinderName(std::addressof(FunctionName))
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