c++ - VS2013 : Can't create vector from one size_t element

Question

只是想确定它确实是一个错误，而且我没有做错什么。它用 gcc (MinGW) 编译得很好:

std::vector<size_t> a({1, 2}); // works
std::vector<size_t> b({1}); // does not work
std::vector<int> c({1}); // works

错误:

error C2440: 'initializing' : cannot convert from 'initializer-list' to 'std::vector<std::seed_seq::result_type,std::allocator<char32_t>>'

Answer 1

这可能是 VS2013 中的一个错误，因为我相信初始化列表已添加到该版本中。请注意，如果您省略 () 它似乎工作正常:

std::vector<size_t> b{ 1 }; // works

尝试其他一些变体也会产生一些令人惊讶的结果:

std::vector<size_t> b({ 1 });            // does not work
std::vector<size_t> b1({ 1u });          // does not work
std::vector<long> b2({ 1 });             // does not work
std::vector<long> b3({ 1l });            // works
std::vector<long long> b4({ 1l });       // does not work
std::vector<unsigned int> b5({ 1u });    // does not work
std::vector<size_t> b6{ 1 };             // works
std::vector<unsigned char> b7({ 1 });    // does not work
std::vector<unsigned char> b8({ 1u });   // works
std::vector<unsigned short> b9({ 1 });   // does not work
std::vector<unsigned short> b10({ 1u }); // works
std::vector<unsigned int> b11({ 1u });   // does not work
std::vector<int> b12({ 1u });            // works
std::vector<int> b13({ 1l });            // works

从上述所有未编译的情况中删除 () 使其工作。