mirror of
https://github.com/boostorg/optional.git
synced 2026-07-21 13:43:39 +00:00
Alan de Freitas
88e2378c8a
GCC 7+ produces false-positive -Wmaybe-uninitialized warnings at -O3 when deeply inlining through union constructors that initialize one member while another (dummy_) exists. This is the same class of false positive addressed in boostorg/variant2#55. The pragmas are placed around the forwarding constructors in both constexpr_union_storage_t and fallback_union_storage_t.
optional
A library for representing optional (nullable) objects in C++.
optional<int> readInt(); // this function may return either an int or a not-an-int
if (optional<int> oi = readInt()) // did I get a real int
cout << "my int is: " << *oi; // use my int
else
cout << "I have no int";
For more information refer to the documentation provided with this library.