C++: Compile error: extra qualification

在编译Kphone4.2时，提示以下错误：

c++ -I/usr/lib/qt3/include -Wall -O3 -I. -I../gsm -I../ilbc -I../dissipate2 -DHAVE_CONFIG_H -DSHARE_DIR=\"/usr/local/share/apps/kphone\" -DPO_DIR=\"/usr/local/share/kphone/translations//\"  -c -o main.o main.cpp
In file included from main.cpp:5:
kcallwidget.h:70: error: extra qualification ‘KCallWidget::’ on member ‘setDTMFSender’
In file included from main.cpp:7:
kphoneview.h:57: error: extra qualification ‘KPhoneView::’ on member ‘DoCall’
make[1]: *** [main.o] 错误 1
make[1]: Leaving directory `/home/soft/kphone/kphone'
make: *** [all] 错误 2

查找原因如下：

很多比较旧的代码会有如写法
class Foo
{

    int Foo::Foo(void);

}
在g++ 4.1以后会报错 extra qualification

直接改为
class Foo
{

    int Foo(void);

}
即可

Extra qualification errors are common with gcc4. This means a class is
redundantly mentioned with a class function. Just remove the part before :: on the mentioned line"

Extra qualification error是使用版本4以上的GCC/G++编译C＋＋程序时经常出现的错误。

这是语句中多引用了类的名称--把函数前面：：的类名称去掉即可

如：

 std::string Socket::connectionName();

connectionName是类Socket的成员函数，而Socket是std 中type为string的子类.

这里不用重复引用Socket，可直接写成

 std::string connectionName();