这篇博客讲述了在使用C++4.4版本的STL算法库时遇到的问题，关于在调用`std::sort`函数时，由于传入了常量fun对象，导致函数试图将const fun作为非const this参数，引发编译错误。详细探讨了问题的原因和解决方法。
In file included from /usr/include/c++/4.4/algorithm:62,
from test.cpp:2:
/usr/include/c++/4.4/bits/stl_algo.h: In function ‘const _Tp& std::__median(const _Tp&, const _Tp&, const _Tp&) [with _Tp = fun]’:
/usr/include/c++/4.4/bits/stl_algo.h:2268: instantiated from ‘void std::__introsort_loop(_RandomAccessIterator, _RandomAccessIterator, _Size) [with _RandomAccessIterator = fun*, _Size = int]’
/usr/include/c++/4.4/bits/stl_algo.h:5220: instantiated from ‘void std::sort(_RAIter, _RAIter) [with _RAIter = fun*]’
test.cpp:32: instantiated from here
/usr/include/c++/4.4/bits/stl_algo.h:89: error: passing ‘const fun’ as ‘this’ argument of ‘bool fun::operator
/usr/include/c++/4.4/bits/stl_algo.h:90: error: passing ‘const fun’ as ‘this’ argument of ‘bool fun::operator
/usr/include/c++/4.4/bits/stl_algo.h:92: error: passing ‘const fun’ as ‘this’ argument of ‘bool fun::operator
/usr/include/c++/4.4/bits/stl_algo.h:96: error: passing ‘const fun’ as ‘this’ argument of ‘bool fun::operator
/usr/include/c++/4.4/bits/stl_algo.h:98: error: passing ‘const fun’ as ‘this’ argument of ‘bool fun::operator
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