...one of the most highly
regarded and expertly designed C++ library projects in the
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// In header: <boost/yap/user_macros.hpp> BOOST_YAP_USER_CALL_OPERATOR_N(expr_template, n)
Defines operator overloads for the call operator taking N parameters ("operator()(t0, t1, ... tn-1)") that each produce an expression instantiated from the expr_template expression template. One overload is defined for each of the qualifiers
&&. For the lvalue reference overloads,
*this is captured by reference into the resulting expression. For the rvalue reference overload,
*this is moved into the resulting expression.
The u parameters to each of the defined overloads may be any type, including an expression. Each non-expression is wrapped in a terminal expression.