boost::optional not letting me reassign const value types...

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Comparison (<), output (<<) and assignment (=) for boost::optional...

how to divide boost::optional<double>?...

Equivalent behaviour for template template arguments to function templates...

How to set a boost::optional back to an uninitialized state?...

Use boost::optional together with boost::adaptors::indirected...

How to implement std::optional's copy constructor?...

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boost::optional return from function...

What is the rationale for boost::none_t implementation?...

C++ optional<> and delayed construction of noncopyable object...

Is using std::optional<int> as efficient as using int?...

init boost::optional of non-copyable object...

boost::optional<T&> vs T*...

Boost Spirit Karma multiple optionals...

boost::optional reference with boost::variant type...

boost::optional with const members...