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Since the containers use std::pair
they're limited to the version from the current standard library. But since
C++11 std::pair
's piecewise_construct
based constructor is very useful, emplace
emulates it with a piecewise_construct
in the boost::unordered
namespace. So for example, the
following will work:
boost::unordered_multimap<std::string, std::complex> x; x.emplace( boost::unordered::piecewise_construct, boost::make_tuple("key"), boost::make_tuple(1, 2));
Older drafts of the standard also supported variadic constructors for std::pair
,
where the first argument would be used for the first part of the pair, and
the remaining for the second part.