Why does this code compile (C++11) without a type mismatch error?

Question

std::vector<char> p = {"abc", "def"};

"abc"和"def"不是char ，为什么编译器没有给出关于这种类型不匹配的错误？

Answer 1

You're not calling vector 's constructor that takes an initializer_list<char> . That constructor is not viable because, as you said, you're not passing a list of char s.

But vector also has a constructor that takes iterators to a range of elements.

template< class InputIt >
vector( InputIt first, InputIt last,
        const Allocator& alloc = Allocator() );

Unfortunately, this constructor matches because the two arguments will each implicitly convert to char const * . But your code has undefined behavior because the begin and end iterators being passed to the constructor are not a valid range.