C ++代码无法编译并产生奇怪的错误

Question

这段c ++代码无法编译。有人知道为什么吗？

#include <functional>
#include <algorithm>
#include <vector>
#include <iostream>

int main(int a, char** v) {

        std::vector<uint32_t> v1 {1,2,3,4};
        std::vector<uint32_t> v2 {0};
        std::vector<uint32_t> v3 {5,4,3,11};
        std::vector<uint32_t> v4 {10,11,2};


        auto vector_is_subset = [] (const std::vector<uint32_t> a, const std::vector<uint32_t> b) -> bool {

                std::sort(a.begin(), a.end());
                std::sort(b.begin(), b.end());
                return std::includes(a.begin(), a.end(), b.begin(), b.end());
        };


        std::vector<uint32_t> f {};

        if (v1.empty() || v2.empty() || v3.empty() || v4.empty() ){
                std::cout << "a vector is empty" << std::endl;
        }


        return 0;
}

我得到以下输出

g ++ a.cpp -std = c ++ 14

在/ usr / include / c ++ / 7 / algorithm：62：0中包含的文件中，来自a.cpp：2：

/usr/include/c++/7/bits/stl_algo.h：实例化'void std :: __ insertion_sort（_RandomAccessIterator，_RandomAccessIterator，_Compare）[with _RandomAccessIterator = __gnu_cxx :: __ normal_iterator>; _Compare = __gnu_cxx :: __ ops :: __ Iter_less_iter]：/ usr / include / c ++ / 7 / bits / stl_algo.h：1885：25：从'void std :: ____ final_insertion_sort（_RandomAccessIterator，_RandomAccessIterator，_ = and [=） __gnu_cxx :: __ normal_iterator>; _Compare = __gnu_cxx :: __ ops :: __ Iter_less_iter]'/usr/include/c++/7/bits/stl_algo.h:1971:31：从'void std :: __ sort（_RandomAccessIterator，_RandomAccessIterator，_Compare）必填[与_RandomAccessIterator :: __ normal_iterator>; _Compare = __gnu_cxx :: __ ops :: __ Iter_less_iter]'/usr/include/c++/7/bits/stl_algo.h:4836:18：从'void std ::

Answer 1

std::sort修改容器以使其排序，但是您将lambda的参数声明为const：

auto vector_is_subset = [] (const std::vector<uint32_t> a, const std::vector<uint32_t> b) -> bool
                         // ^^^^                           ^^^^^

删除它们，它应该可以编译。