C++ 腾讯2010笔试
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[已解决问题]
解决于 2009-11-13 21:27
<p class="MsoNormal" style="text-indent: -18pt; margin: 0cm 0cm 0pt 18pt; mso-list: l0 level1 lfo1; tab-stops: list 18.0pt;"><span style="font-family: Arial; letter-spacing: 0.4pt; color: black; mso-bidi-font-size: 10.5pt; mso-fareast-font-family: Arial;" lang="EN-US"><span style="mso-list: Ignore;"><span style="font-size: small;">1.</span><span style="font: 7pt "Times New Roman";"> </span></span></span><span style="font-size: small;"><span style="font-family: Arial; letter-spacing: 0.4pt; color: black; mso-bidi-font-size: 10.5pt;" lang="EN-US">C++</span><span style="font-family: 宋体; letter-spacing: 0.4pt; color: black; mso-bidi-font-size: 10.5pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial;">将父类的析构函数定义为虚函数，下列正确的是哪个？</span><span style="font-family: Arial; letter-spacing: 0.4pt; color: black; mso-bidi-font-size: 10.5pt;" lang="EN-US"></span></span></p>
<p class="MsoNormal" style="text-indent: -21pt; margin: 0cm 0cm 0pt 42pt; mso-list: l0 level2 lfo1; tab-stops: list 42.0pt;"><span style="font-family: Arial; letter-spacing: 0.4pt; color: black; mso-bidi-font-size: 10.5pt; mso-fareast-font-family: Arial;" lang="EN-US"><span style="mso-list: Ignore;"><span style="font-size: small;">a)</span><span style="font: 7pt "Times New Roman";"> </span></span></span><span style="font-size: small;"><span style="font-family: 宋体; letter-spacing: 0.4pt; color: black; mso-bidi-font-size: 10.5pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial;">释放父类指针时能正确释放子类对象</span><span style="font-family: Arial; letter-spacing: 0.4pt; color: black; mso-bidi-font-size: 10.5pt;" lang="EN-US"></span></span></p>
<p class="MsoNormal" style="text-indent: -21pt; margin: 0cm 0cm 0pt 42pt; mso-list: l0 level2 lfo1; tab-stops: list 42.0pt;"><span style="font-family: Arial; letter-spacing: 0.4pt; color: black; mso-bidi-font-size: 10.5pt; mso-fareast-font-family: Arial;" lang="EN-US"><span style="mso-list: Ignore;"><span style="font-size: small;">b)</span><span style="font: 7pt "Times New Roman";"> </span></span></span><span style="font-size: small;"><span style="font-family: 宋体; letter-spacing: 0.4pt; color: black; mso-bidi-font-size: 10.5pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial;">释放子类指针时能正确释放父类对象</span><span style="font-family: Arial; letter-spacing: 0.4pt; color: black; mso-bidi-font-size: 10.5pt;" lang="EN-US"></span></span></p>
<p class="MsoNormal" style="text-indent: -21pt; margin: 0cm 0cm 0pt 42pt; mso-list: l0 level2 lfo1; tab-stops: list 42.0pt;"><span style="font-family: Arial; letter-spacing: 0.4pt; color: black; mso-bidi-font-size: 10.5pt; mso-fareast-font-family: Arial;" lang="EN-US"><span style="mso-list: Ignore;"><span style="font-size: small;">c)</span><span style="font: 7pt "Times New Roman";"> </span></span></span><span style="font-size: small;"><span style="font-family: 宋体; letter-spacing: 0.4pt; color: black; mso-bidi-font-size: 10.5pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial;">这样做是错误的</span><span style="font-family: Arial; letter-spacing: 0.4pt; color: black; mso-bidi-font-size: 10.5pt;" lang="EN-US"></span></span></p>
<p class="MsoNormal" style="text-indent: -21pt; margin: 0cm 0cm 0pt 42pt; mso-list: l0 level2 lfo1; tab-stops: list 42.0pt;"><span style="font-family: Arial; letter-spacing: 0.4pt; color: black; mso-bidi-font-size: 10.5pt; mso-fareast-font-family: Arial;" lang="EN-US"><span style="mso-list: Ignore;"><span style="font-size: small;">d)</span><span style="font: 7pt "Times New Roman";"> </span></span></span><span style="font-family: 宋体; letter-spacing: 0.4pt; color: black; mso-bidi-font-size: 10.5pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial;"><span style="font-size: small;">以上全错</span></span><span style="font-family: Arial; letter-spacing: 0.4pt; color: black; mso-bidi-font-size: 10.5pt;" lang="EN-US"></span></p>
最佳答案
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父类的析构函数必须定义为虚函数，这个可以在effective C++中看到，具体是哪个条款记不太清楚了。
C++的多态肯定是使用父类的指针指向子类的对象，所以肯定是释放子类的对象，如果不使用虚函数的话，父类的指针就只能够释放父类的对象。