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Added "vestigial" comments for downlevel feature test workarounds

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This commit is contained in:
Herb Sutter 2020-12-18 12:18:23 -08:00
parent 070db845f8
commit c78ad8661c
1 changed files with 3 additions and 3 deletions
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6
include/gsl/assert
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@ -105,19 +105,19 @@ class contract_group {
public:
#ifdef __cpp_noexcept_function_type
using handler = void (*)() noexcept;
#else
#else // VESTIGIAL, remove when no longer needed for downlevel compilers
using handler = void (*)();
#endif
#if defined(__cpp_constexpr) && __cpp_constexpr >= 201806
constexpr contract_group (handler h) { set_handler(h); }
#else
#else // VESTIGIAL, remove when no longer needed for downlevel compilers
constexpr contract_group (handler h) : chandler(h ? h : []()noexcept{}) { }
#endif
#if __cplusplus >= 202002L
constexpr auto set_handler(handler h) -> handler { return std::exchange(chandler, h ? h : []()noexcept{}); }
#else
#else // VESTIGIAL, remove when no longer needed for downlevel compilers
constexpr auto set_handler(handler h) -> handler { auto old = chandler;
chandler = h ? h : []()noexcept{};
return old;