检查 Cython 中的数组中是否存在值 [英] Check if a value exists in an array in Cython

问题描述

我想知道如何检查数组中是否存在值或对象，例如在 python 中:

I want to know how to check if a value or a object exists in an array, like in python:

a = [1,2,3,4,5]
b = 4
if b in a:
    print("True!")
else:
    print("False")

我想知道cython中是否已经存在类似的东西.我有一个指针结构对象数组；我想知道该对象是否存在于该数组中.

I want to know if something similar already exists in cython. I have a struct object array of pointers; I want to know if the object exists in this array.

喜欢

cdef Node *array

array = <Node *>malloc( 5 * cython.sizeof(Node))

for i in range(5):
     array[i].index = i

cdef Node test = array[3]

if test in array:
    print("True!")

cdef struct Node:
    int index

上面的代码不正确，但它说明了我的意思.

The code above is not correct, but it illustrates what I mean.

推荐答案

您几乎必须遍历数组并检查每个元素.

You pretty much have to iterate through the array and check each element.

#include <stdbool.h>

bool isvalueinarray(int val, int *arr, int size){
    int i;
    for (i=0; i < size; i++) {
        if (arr[i] == val)
            return true;
    }
    return false;
}

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