C++运算符重载需要注意的地方

class CMyCls51Testing软件测试网/fa.~%U|xP ]*|:|,B
{
t&Od-U;S(},Vh0public:
lK s[;S,L0 bool perator == (const CMyCls& rhs);    // 1.51Testing软件测试网omn\lo}IF
 51Testing软件测试网;b#o(d$x/I1e{0BN
 bool perator == (const CMyCls& rhs) const;   // 2.

 bool perator == (CMyCls& rhs);      // 3.

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}

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n"t0void f3 (CMyCls& lhs, CMyCls& rhs);51Testing软件测试网*h,btf;bD){n
{
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void f4 (const CMyCls& lhs, CMyCls& rhs)51Testing软件测试网B I$pLGw0D
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{
zMB%pM]0 lhs == rhs;51Testing软件测试网 A Y"V3tu_I
}

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Mu0class CMyCls51Testing软件测试网zF`Ee
{
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 bool perator == (const CMyCls& rhs) const51Testing软件测试网 y!sG\[]1|a%T
 {
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 }51Testing软件测试网5Kvf8aWbT)s
};

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{
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}

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y5Y2pv U5H_+DE @T"L0void f(const CMyCls& lhs, const CMyCls& rhs)
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 lhs == rhs;51Testing软件测试网~ [0Y&fX M0L(~2N!|o
}

class CMyCls
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 bool perator == (const CMyCls& rhs)
6vv]8T(r3Y*{5w:y0 {
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 }51Testing软件测试网 og2Q-tZu.A5Ue0m
};

A$OH0]6t\0bool perator == (const CMyCls& lhs, const CMyCls& rhs)51Testing软件测试网iEqd.WX
{51Testing软件测试网P!DIZq
 // ...
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void f1(const CMyCls& lhs, const CMyCls& rhs)51Testing软件测试网S)D#[j$Q)n
{
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}51Testing软件测试网-oL:X U0r

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void f2(CMyCls& lhs, const CMyCls& rhs)51Testing软件测试网i
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{
(q W4u({X+J0K.B0 lhs == rhs;51Testing软件测试网es+LG6UF'D|7L)n
}