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remove gcc noexcept warning (#1122)

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Without this change a `gsl::not_null<class_type>` triggers these `noexcept` warnings:
```
.../gsl/include/gsl/pointers:162:50: warning: noexcept-expression evaluates to ‘false’ because of a call to ‘constexpr gsl::details::value_or_reference_return_t<T> gsl::not_null<T>::get() const [with T = class_type*; gsl::details::value_or_reference_return_t<T> = class_type* const]’ [-Wnoexcept]
  162 |                 const not_null<U>& rhs) noexcept(noexcept(lhs.get() == rhs.get()))
      |                                                  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.../gsl/include/gsl/pointers:119:55: note: but ‘constexpr gsl::details::value_or_reference_return_t<T> gsl::not_null<T>::get() const [with T = class_type*; gsl::details::value_or_reference_return_t<T> = class_type* const]’ does not throw; perhaps it should be declared ‘noexcept’
  119 |     constexpr details::value_or_reference_return_t<T> get() const
      |                                                       ^~~
```

Co-authored-by: Werner Henze <w.henze@avm.de>
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Werner Henze 2023-06-29 00:17:12 +02:00 committed by GitHub
parent 3549e31ba4
commit 87e21400dc
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include/gsl/pointers
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@ -117,6 +117,7 @@ public:
not_null(const not_null& other) = default; not_null(const not_null& other) = default;
not_null& operator=(const not_null& other) = default; not_null& operator=(const not_null& other) = default;
constexpr details::value_or_reference_return_t<T> get() const constexpr details::value_or_reference_return_t<T> get() const
noexcept(noexcept(details::value_or_reference_return_t<T>{ptr_}))
{ {
return ptr_; return ptr_;
} }