test/std/utilities/template.bitset/bitset.cons/string_ctor.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
//
//===----------------------------------------------------------------------===//

// test bitset(string, pos, n, zero, one);

#include <bitset>
#include <algorithm> // for 'min' and 'max'
#include <cassert>
#include <stdexcept> // for 'invalid_argument'
#include <string>

#include "test_macros.h"

template <std::size_t N>
void test_string_ctor() {
#ifndef TEST_HAS_NO_EXCEPTIONS
    {
        try {
            std::string s("xxx1010101010xxxx");
            std::bitset<N> v(s, s.size()+1, 10);
            assert(false);
        }
        catch (std::out_of_range&)
        {
        }
    }
    {
        try {
            std::string s("xxx1010101010xxxx");
            std::bitset<N> v(s, 2, 10);
            assert(false);
        }
        catch (std::invalid_argument&)
        {
        }
    }
    {
        try {
            std::string s("xxxbababababaxxxx");
            std::bitset<N> v(s, 2, 10, 'a', 'b');
            assert(false);
        }
        catch (std::invalid_argument&)
        {
        }
    }
#endif // TEST_HAS_NO_EXCEPTIONS
    {
        std::string s("xxx1010101010xxxx");
        std::bitset<N> v(s, 3, 10);
        std::size_t M = std::min<std::size_t>(v.size(), 10);
        for (std::size_t i = 0; i < M; ++i)
            assert(v[i] == (s[3 + M - 1 - i] == '1'));
        for (std::size_t i = 10; i < v.size(); ++i)
            assert(v[i] == false);
    }
    {
        std::string s("xxxbababababaxxxx");
        std::bitset<N> v(s, 3, 10, 'a', 'b');
        std::size_t M = std::min<std::size_t>(v.size(), 10);
        for (std::size_t i = 0; i < M; ++i)
            assert(v[i] == (s[3 + M - 1 - i] == 'b'));
        for (std::size_t i = 10; i < v.size(); ++i)
            assert(v[i] == false);
    }
}

struct Nonsense {
    virtual ~Nonsense() {}
};

void test_for_non_eager_instantiation() {
    // Ensure we don't accidentally instantiate `std::basic_string<Nonsense>`
    // since it may not be well formed and can cause an error in the
    // non-immediate context.
    static_assert(!std::is_constructible<std::bitset<3>, Nonsense*>::value, "");
    static_assert(!std::is_constructible<std::bitset<3>, Nonsense*, size_t, Nonsense&, Nonsense&>::value, "");
}

int main(int, char**) {
    test_string_ctor<0>();
    test_string_ctor<1>();
    test_string_ctor<31>();
    test_string_ctor<32>();
    test_string_ctor<33>();
    test_string_ctor<63>();
    test_string_ctor<64>();
    test_string_ctor<65>();
    test_string_ctor<1000>();
    test_for_non_eager_instantiation();

    return 0;
}