Before C++17, template deduction [basically] worked in two situations: deduction function parameters in function templates and deducing auto for variables/return types in functions. There was no mechanism to deduce template parameters in class templates. The result of that was— whenever you used...
optional<T&> - Yes, we need it
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Should Span Be Regular
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Non-Ownership and Generic Programming and Regular types, oh my!
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Without form and void
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Just dropped in to see what condition my condition was in
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optional<T> in a possible C++20 future
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Chaining Comparisons: Seeking Information from the Audience
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optional<bool>: reference or constexpr?
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Implementing the spaceship operator for optional
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