libcxx/test/std/experimental/algorithms/alg.search/search.pass.cpp

//===----------------------------------------------------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

// UNSUPPORTED: c++98, c++03, c++11

// <algorithm>

//   template<class ForwardIterator, class Searcher>
//   ForwardIterator search(ForwardIterator first, ForwardIterator last,
//                          const Searcher& searcher);
//
//      returns searcher.operator(first, last).first
//

#include <experimental/algorithm>
#include <cassert>

#include "test_iterators.h"

int searcher_called = 0;

struct MySearcher {
    template <typename Iterator>
    std::pair<Iterator, Iterator>
    operator() (Iterator b, Iterator e) const
    {
        ++searcher_called;
        return std::make_pair(b, e);
    }
};


int main() {
    typedef int * RI;
    static_assert((std::is_same<RI, decltype(std::experimental::search(RI(), RI(), MySearcher()))>::value), "" );

    RI it(nullptr);
    assert(it == std::experimental::search(it, it, MySearcher()));
    assert(searcher_called == 1);
}