para/GSL
1
0
Fork 0
mirror of https://github.com/microsoft/GSL.git synced 2024-11-03 17:56:43 -05:00
Code Issues Actions Packages Projects Releases Wiki Activity

Replaced some of the previous workarounds with feature tests

Browse Source 
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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

29
include/gsl/assert
View File

@ -102,29 +102,32 @@ namespace details
class contract_group {
public:
// TODO: change this back to unconditionally noexcept
// again once all supported compilers allow it
using handler = void (*)() /*noexcept*/;
#ifdef __cpp_noexcept_function_type
using handler = void (*)() noexcept;
#else
using handler = void (*)();
#endif
contract_group (handler h) { set_handler(h); }
auto set_handler(handler h) -> handler { if (!h) h = []()noexcept{};
return chandler.exchange(h); }
auto set_handler(handler h) -> handler { return chandler.exchange(h ? h : []()noexcept{}); }
auto get_handler() -> handler { return chandler; }
constexpr void expects (bool b) { assertion(b); }
constexpr void ensures (bool b) { assertion(b); }
private:
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{ ... };"
// again once all supported compilers allow it
static contract_group Default { &gsl::details::terminate };
static contract_group Bounds { Default.get_handler() };
static contract_group Null { Default.get_handler() };
static contract_group Testing { Default.get_handler() };
auto static Default = contract_group( &gsl::details::terminate );
auto static Bounds = contract_group( Default.get_handler() );
auto static Null = contract_group( Default.get_handler() );
auto static Testing = contract_group( Default.get_handler() );
} // namespace gsl