从键盘向两个vector vec和vec2填充字符串的程序：

#include <iostream> // For standard streams
#include <string>
#include <vector>
#include <algorithm>
#include <iterator>

using namespace std;

static void cin_state(void)
{
    cout << "[fail,eof,bad]: ["
        << cin.fail() << cin.eof() << cin.bad()
        << "], state-good: " << cin.good() << endl;
}

static void cin_clear(void)
{
    cout << "\n=>before cin.clear()";
    cin_state();
    cin.clear();
    cout << "  after cin.clear()";
    cin_state();
}

int main(void)
{
    std::vector<std::string> vec, vec2;
    std::copy(std::istream_iterator<std::string> {std::cin},
        std::istream_iterator<std::string>{},
        std::back_inserter(vec));
    std::copy(std::cbegin(vec),
        std::cend(vec),
        std::ostream_iterator<std::string>{std::cout, " "});
    
    cin_clear();

    std::copy(std::istream_iterator<std::string> {std::cin},
        std::istream_iterator<std::string>{},
        std::back_inserter(vec2));
    
    return 0;
}

Win10+vs2019没有问题


Linux下vec2根本就没有机会输入，好像车子挂不上档，即使我增加std::cin.ignore()也没有用：
$  Snippets ./a.out
akdf kdfj ksdj fksdfj dsf
akdf kdfj ksdj fksdfj dsf
=>before cin.clear()[fail,eof,bad]: [110], state-good: 0
  after cin.clear()[fail,eof,bad]: [000], state-good: 1
$  Snippets
--
修改:ActiveIon FROM 61.149.156.*
FROM 61.149.156.*