stockListType.cpp:58:从这里实例化
/usr/include/c++/4.2.1/bits/stl_algo.h:91: error: passing ‘const stockType’ as ‘this’ argument of ‘bool stockType::operator<(const stockType&)’ discards qualifiers
/usr/include/c++/4.2.1/bits/stl_algo.h:92: error: passing ‘const stockType’ as ‘this’ argument of ‘bool stockType::operator<(const stockType&)’ discards qualifiers
/usr/include/c++/4.2.1/bits/stl_algo.h:94: error: passing ‘const stockType’ as ‘this’ argument of ‘bool stockType::operator<(const stockType&)’ discards qualifiers
/usr/include/c++/4.2.1/bits/stl_algo.h:98: error: passing ‘const stockType’ as ‘this’ argument of ‘bool stockType::operator<(const stockType&)’ discards qualifiers
/usr/include/c++/4.2.1/bits/stl_algo.h:100: error: passing ‘const stockType’ as ‘this’ argument of ‘bool stockType::operator<(const stockType&)’ discards qualifiers
以上是我得到的错误,希望有人向我解释这意味着什么.我通过在重载运算符前面放置一个常量来解决错误.我的程序是一个股票市场应用程序,它读取包含字符串,5个双精度和int的文件.我们通过字符串符号和索引增益来整理程序.这本书指示我使用向量来存储每个数据.如下所示,重载运算符会比较每个符号,并使用容器的排序成员函数对其进行排序.我的问题是为什么我必须在>和<的重载运算符前放置一个常量.但不是> =,<=,==,!=重载运算符.
//function was declared in stockType.h and implemented …c++ ×1