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

//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

// 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_macros.h"
#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(int, char**) {
    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);

  return 0;
}