c++ - 错误 : no type named 'vector' in namespace 'std'

Question

为什么会这样？

error: no type named 'vector' in namespace 'std'; did you mean 'hecto'? void askForVector(std::vector * vector);

#include <iostream>
#include <vector>

void askForVector(std::vector * vector);

int main()
{
    std::vector<int> vector;
    int size;
    askForVector(&vector);
    std::cout << "\nsize: " << vector.size() << std::endl;
    std::cout << vector.at(0);
}


void askForVector(std::vector * vector)
{
    int size;
    std::cout << "please insert the size of vector to order: ";
    std::cin >> size;

    vector->resize(size);

    for(int i = 0; i<size; i++){
        std::cout <<  "please insert a value for the " << i+1 << " position: " ;
        std::cin >> vector[i];
    }

    for(int j: *vector)
        std::cout << ":"<<j;
    std::cout  << ":\n";
}

Answer 1

vector 是模板，不是类型。要么指定一个特定的专业:

void askForVector(std::vector<int> * vector);

或者使函数通用

template <typename T>
void askForVector(std::vector<T> * vector);

使用引用而不是指针可能会更好:

void askForVector(std::vector<int> & vector);

或按值返回 vector :

std::vector<int> askForVector() {
    std::vector<int> vector;
    // your code here
    return vector;
}

避免类似的错误

std::cin >> vector[i]; // should be (*vector)[i]