protect¶
Header¶
#include <boost/hof/protect.hpp>
Description¶
The protect function adaptor can be used to make a bind expression be
treated as a normal function instead. Both bind and
lazy eargerly evaluates nested bind expressions.
The protect adaptor masks the type so bind or
lazy no longer recognizes the function as bind
expression and evaluates it.
Synopsis¶
template<class F>
constexpr protect_adaptor<F> protect(F f);
Semantics¶
assert(lazy(f)(protect(lazy(g)(_1)))() == f(lazy(g)(_1)))
Example¶
#include <boost/hof.hpp>
#include <cassert>
using namespace boost::hof;
int main() {
auto lazy_id = lazy(identity)(_1);
auto lazy_apply = lazy(apply)(protect(lazy_id), _1);
assert(lazy_apply(3) == 3);
}