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DEFER: more defer types

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BlackMATov
2020-02-13 02:59:07 +07:00
parent 6602512891
commit 0b1563b66b
1 changed files with 55 additions and 2 deletions
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57
headers/enduro2d/utils/defer.hpp
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@@ -18,19 +18,72 @@ namespace e2d
explicit defer_impl(F f)
: f_(std::move(f)) {}
~defer_impl() noexcept(std::is_nothrow_invocable_v<F>) {
~defer_impl() noexcept {
f_();
}
private:
F f_;
};
template < typename F >
class error_defer_impl final : noncopyable {
public:
explicit error_defer_impl(F f)
: f_(std::move(f))
, exceptions_(std::uncaught_exceptions()) {}
~error_defer_impl() noexcept {
if ( exceptions_ != std::uncaught_exceptions() ) {
f_();
}
}
private:
F f_{};
int exceptions_{};
};
template < typename F >
class return_defer_impl final : noncopyable {
public:
explicit return_defer_impl(F f)
: f_(std::move(f))
, exceptions_(std::uncaught_exceptions()) {}
~return_defer_impl() noexcept {
if ( exceptions_ == std::uncaught_exceptions() ) {
f_();
}
}
private:
F f_{};
int exceptions_{};
};
}
template < typename F >
impl::defer_impl<std::decay_t<F>> make_defer(F&& f) {
return impl::defer_impl<std::decay_t<F>>(std::forward<F>(f));
}
template < typename F >
impl::error_defer_impl<std::decay_t<F>> make_error_defer(F&& f) {
return impl::error_defer_impl<std::decay_t<F>>(std::forward<F>(f));
}
template < typename F >
impl::return_defer_impl<std::decay_t<F>> make_return_defer(F&& f) {
return impl::return_defer_impl<std::decay_t<F>>(std::forward<F>(f));
}
}
#define E2D_DEFER(lambda)\
auto E2D_PP_CAT(e2d_generated_defer_, __LINE__) = ::e2d::make_defer(lambda)
auto E2D_PP_CAT(e2d_generated_defer_, __LINE__) =\
::e2d::make_defer(lambda)
#define E2D_ERROR_DEFER(lambda)\
auto E2D_PP_CAT(e2d_generated_error_defer_, __LINE__) =\
::e2d::make_error_defer(lambda)
#define E2D_RETURN_DEFER(lambda)\
auto E2D_PP_CAT(e2d_generated_return_defer_, __LINE__) =\
::e2d::make_return_defer(lambda)