Question

我正在尝试使用C ++进行项目，并且试图输入从整数类型向量到成对类型向量的值。

我尝试了emplace_back和push_back，但是它不起作用。很有可能是由于成对输入的向量。

注意：我正在使用Boost库，不确定是否有帮助。

typedef unsigned int objecttype;
typedef string operationtype;

typedef unsigned int checkob;

typedef pair<objecttype, operationtype> objectops;

vector<vector<unsigned int>> parameters;
//lines returning values to “parameters”
vector<checkob> checkParams = parameters.at(0);    // works fine
vector<objectops> objectParams = parameters.at(1); // below error

错误消息：

error test.cpp:273:30: error: no viable conversion from 'vector<unsigned int, allocator<unsigned int>>' to 'vector<model:: objectops, allocator<std::pair<unsigned int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >>>'
stl_vector.h:326:7: note: candidate constructor not viable: no known conversion from '__gnu_cxx::__alloc_traits<std::allocator<std::vector<unsigned int, std::allocator<unsigned int> > > >::value_type' (aka 'std::vector<unsigned int, std::allocator<unsigned int> >') to 'const std::vector<std::pair<unsigned int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<unsigned int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > > &' for 1st argument
stl_vector.h:344:7: note: candidate constructor not viable: no known conversion from '__gnu_cxx::__alloc_traits<std::allocator<std::vector<unsigned int, std::allocator<unsigned int> > > >::value_type' (aka 'std::vector<unsigned int, std::allocator<unsigned int> >') to 'std::vector<std::pair<unsigned int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<unsigned int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > > &&' for 1st argument
stl_vector.h:383:7: note: candidate constructor not viable: no known conversion from '__gnu_cxx::__alloc_traits<std::allocator<std::vector<unsigned int, std::allocator<unsigned int> > > >::value_type' (aka 'std::vector<unsigned int, std::allocator<unsigned int> >') to 'initializer_list<std::vector<std::pair<unsigned int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<unsigned int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >::value_type>' (aka 'initializer_list<std::pair<unsigned int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >') for 1st argument

Answer 1

您正在尝试将std::vector<unsigned int>分配给std::pair<unsigned int, std::string>，这显然是不可能的。

您可以

将std::pair<unsigned int, std::string>的向量分配给 objectParams
或使用一对 vector元素的列表初始化 unsigned int的无符号int egers（即parameters）向量的向量和一个std::string。

您可能是这个意思：

vector<objectops> objectParams ={ {  parameters.at(0).at(0), "string"} };
//                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^    std::pair<objecttype, operationtype>
//                              ^^                                     ^^ for std::vector<objectops>

如何在向量对中输入单个值？

1 个答案: