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Replaced some of the previous workarounds with feature tests

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As always with feature tests, they can only be used to aggressively adopt new features even before all compilers we need have the features -- the test lets us write a vestigial workaround for downllevel compilers, to be removed as soon as all compilers support the feature.
This commit is contained in:
Herb Sutter 2020-12-18 11:20:03 -08:00
parent 8dfd03feeb
commit 1c37688ccd
1 changed files with 18 additions and 15 deletions
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29
include/gsl/assert
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@ -102,29 +102,32 @@ namespace details
class contract_group { class contract_group {
public: public:
// TODO: change this back to unconditionally noexcept #ifdef __cpp_noexcept_function_type
// again once all supported compilers allow it using handler = void (*)() noexcept;
using handler = void (*)() /*noexcept*/; #else
using handler = void (*)();
#endif
contract_group (handler h) { set_handler(h); } contract_group (handler h) { set_handler(h); }
auto set_handler(handler h) -> handler { if (!h) h = []()noexcept{}; auto set_handler(handler h) -> handler { return chandler.exchange(h ? h : []()noexcept{}); }
return chandler.exchange(h); }
auto get_handler() -> handler { return chandler; } auto get_handler() -> handler { return chandler; }
constexpr void expects (bool b) { assertion(b); } constexpr void expects (bool b) { assertion(b); }
constexpr void ensures (bool b) { assertion(b); } constexpr void ensures (bool b) { assertion(b); }
private: private:
constexpr void assertion(bool b) { if (!b) chandler.load()(); } constexpr void assertion(bool b) { if (!b) chandler.load()(); }
std::atomic<handler> chandler;
#ifdef __cpp_guaranteed_copy_elision
std::atomic<handler> chandler; // current handler
#else
handler chandler;
#endif
}; };
// TODO: change this back to "auto static Blah = contract_group{ ... };" auto static Default = contract_group( &gsl::details::terminate );
// again once all supported compilers allow it auto static Bounds = contract_group( Default.get_handler() );
static contract_group Default { &gsl::details::terminate }; auto static Null = contract_group( Default.get_handler() );
static contract_group Bounds { Default.get_handler() }; auto static Testing = contract_group( Default.get_handler() );
static contract_group Null { Default.get_handler() };
static contract_group Testing { Default.get_handler() };
} // namespace gsl } // namespace gsl