成员名称不应被覆盖

成员函数内的局部名称与成员名称相同会干扰阅读，易引起误解。

示例：

class A {
    int i = 0;          // Member object ‘i’

public:
    int foo() {
        int i = 0;      // Non-compliant, hides the member ‘i’
        return bar(i);
    }

    int bar(int i) {    // Non-compliant, hides the member ‘i’
        return i + i;   // Which ‘i’ is used?
    }
};

建议成员对象遵循统一的命名约定，如以“_”结尾或以“m_”开头，可有效规避这类问题：

class A {
    int i_ = 0;         // Member object ‘i_’

public:
    int foo() {
        int i = 0;      // Compliant
        return bar(i);
    }

    int bar(int i) {    // Compliant
        return i_ + i;
    }
};