how many data types does boost variant support?

StackOverflow https://stackoverflow.com/questions/17027640

  •  31-05-2022
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Question

Consider the following:

// what is N?
typedef boost::variant<T1, ..., TN> variant_t;

How many template parameters are acceptable here?

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Solution

The answer is hidden in the documentation:

http://www.boost.org/doc/libs/1_53_0/doc/html/BOOST_VARIANT_LIMIT_TYPES.html

// In header: <boost/variant/variant_fwd.hpp>

BOOST_VARIANT_LIMIT_TYPES
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