Fix build when `BOOST_BIND_NO_PLACEHOLDERS` is defined

boostorg / property_tree

Boost.org property_tree module

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Fix build when `BOOST_BIND_NO_PLACEHOLDERS` is defined #101

Closed Osyotr closed 10 months ago

Osyotr commented 2 years ago

<boost/bind/placeholders.hpp> should be explicitly included here, because <boost/bind/bind.hpp> may not include it depending on whether BOOST_BIND_NO_PLACEHOLDERS is defined or not.