[英]Assigning to 'int *' from incompatible type 'value_type' (aka 'std::__1::vector<int, std::__1::allocator<int> >')
有誰知道如何調用向量指針，以便可以將其分配給整數？ 以下是代碼：
void floodFillwithColor(vector<vector<int>>* M, int x, int y, int newC){
int* prevC = M[x][y];
int* newCPtr = &newC;
floodFillUtil(M, x, y, prevC, newCPtr);
};
如何調用向量指針，以便可以將其分配給整數？
您不能調用向量指針，但是可以使用間接運算符獲取對指向對象的引用，然后在該引用上應用下標運算符：
if(M)
int some_value = (*M)[x][y]; // assign to an integer
else
// handle the case where M is null
無法轉換'std :: optional <int> 'to'__gnu_cxx :: __ alloc_traits <std::allocator<char> > :: value_type {aka char}'
[英]cannot convert 'std::optional<int>' to '__gnu_cxx::__alloc_traits<std::allocator<char> >::value_type {aka char}'
v <int> pos（MAX）v <int> tmp哪個是非類型'__gnu_cxx :: __ alloc_traits <std::allocator<int> > :: value_type {aka int}'pos [i] .push_back（tmp）;
[英]v<int>pos(MAX) v<int> tmp Which is of non-class type ‘__gnu_cxx::__alloc_traits<std::allocator<int> >::value_type {aka int}’ pos[i].push_back(tmp);
引用綁定到 null 類型的指針 'std::vector <int, std::allocator<int> >' (stl_vector.h)</int,>
[英]Reference binding to null pointer of type 'std::vector<int, std::allocator<int>>' (stl_vector.h)
無法轉換 'std::vector<double> *' 到 '__gnu_cxx::__alloc_traits <std::allocator<double*> , double*>::value_type' {aka 'double*'} </std::allocator<double*></double>
[英]cannot convert ‘std::vector<double>*’ to ‘__gnu_cxx::__alloc_traits<std::allocator<double*>, double*>::value_type’ {aka ‘double*’}
對“std::vector”類型的 null 指針的引用綁定<int, std::allocator<int> >"</int,>
[英]Reference binding to null pointer of type "std::vector<int, std::allocator<int>>"
沒有來自“lambda []()-> 的合適的用戶定義轉換<error-type> " 到 " 常量 std::vector <int, std::allocator<int> >"
[英]no suitable user-defined conversion from "lambda []()-><error-type>" to "const std::vector<int, std::allocator<int>>"
轉換為std :: array <unsigned char, 1ul> :: int中的value_type可能會改變其值
[英]Conversion to std::array<unsigned char, 1ul>::value_type from int may alter its value
用用戶定義的類和 int 創建一個向量在 'struct std::_Vector_base 的實例化中......'class MyClass'中沒有名為'value_type'的類型
[英]creating a vector with user defined class and int In instantiation of ‘struct std::_Vector_base....no type named ‘value_type’ in ‘class MyClass’
應該（在C ++ 11中）std :: vector :: resize（size_type）是否適用於默認的可構造的value_type int [4]？
[英]Should (in C++11) std::vector::resize(size_type) work for the default constructible value_type int[4]?
std :: vector <int，std :: allocator <char >>是否有效？
[英]Is std::vector<int, std::allocator<char> > valid?
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