如何优化C++代码以实现高效嵌入式系统开发的各项功能

void modifyValue(int& value) {
    value = 100;
}

void modifyValueWithPointer(int* value) {
    *value = 100;
}

int main() {
    int num = 10;
    modifyValue(num);
    cout << num << endl; // 输出100

    int num2 = 20;
    modifyValueWithPointer(&num2);
    cout << num2 << endl; // 输出100

    return 0;
}

const int BUFFER_SIZE = 100;

void processArray(const int* array, int size) {
    // 处理数组逻辑
}

int main() {
    int array[BUFFER_SIZE]; // 使用数组代替动态分配的内存
    int size = BUFFER_SIZE;

    processArray(array, size);

    return 0;
}

#include <vector>
#include <algorithm>

int main() {
    std::vector<int> vec = {3, 2, 1};

    std::sort(vec.begin(), vec.end());

    for (int num : vec) {
        cout << num << " ";
    }
    cout << endl; // 输出1 2 3

    return 0;
}

inline int square(int num) {
    return num * num;
}

int main() {
    int result = square(5);
    cout << result << endl; // 输出25

    return 0;
}

int sum(int* array, int size) {
    int result = 0;
 
    // 循环展开
    for (int i = 0; i < size; i += 4) {
        result += array[i] + array[i+1] + array[i+2] + array[i+3];
    }
    
    // 处理剩余的元素
    for (int i = size - size % 4; i < size; i++) {
        result += array[i];
    }

    return result;
}

int main() {
    int array[] = {1, 2, 3, 4, 5, 6, 7, 8};
    int size = sizeof(array) / sizeof(int);
 
    int result = sum(array, size);
    cout << result << endl; // 输出36

    return 0;
}