passing as 'this' argument discards qualifier 1、问题描述 有这样一个函数 void setInfo(const std::map<std::string,std::string>& config) 1. { 1. std::string a = config["aaa"]; 1. } 1. 2、编译现象 如标题 3、解释 config变量是一个const的,但是在内部函数里调用了这个变量的符号重载函数...
passing as 'this' argument discards qualifier 1、问题描述 有这样一个函数 voidsetInfo(conststd::map<std::string,std::string>&config) { std::string a = config["aaa"]; } 2、编译现象 如标题 3、解释 config变量是一个const的,但是在内部函数里调用了这个变量的符号重载函数"[ ]",而我们规定const...
C++编程常见问题—error: passing 'const std::map<>]' discards qualifiers或pass-by-reference-to-const-map导致的“d } 解决办法有两个:
error: passing ‘const Objectmap {aka const std::map<std::basic_string<char>, std::shared_ptr<Objects> >}’ as ‘this’ argument of ‘std::map<_Key, _Tp, _Compare, _Alloc>::iterator std::map<_Key, _Tp, _Compare, _Alloc>::erase(std::map<_Key, _Tp, _Compare, _Alloc>::co...
In member function'int Something::getValue2(const string&) const':17:68: error: passing'const std::unordered_map<std::basic_string<char>, int>'as'this'argument of'std::unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>::mapped_type& std::unordered_map<_Key, _Tp,...
编写程序时无意中发现使用const修饰的map容器变量无法使用重载的[]运算符来获取相应的键值,于是编写测试用例进行验证,如下 #include <map>#include<string>#include<iostream>usingnamespacestd;intmain() { map<int,string>test;//可以test[16] ="hello"; ...
{ // Wrap a function with variable arguments auto f1 = fn<int,int,const std::string>(my_wrapped_function); auto result = wrapper(f1, 42, std::string("hello")); // Result should be 43: // Wrap a function that modifies its arguments auto f2 = fn<void,int&>(my_argument_modifier...
writeProtEvt.cp p: In member function `virtual void A::print(const B*)': writeProtEvt.cp p:24: error: passing `const B' as `this' argument of `virtual void B::print()' discards qualifiers Can anyone explain how to do this the right way? thanks in advance, Anthony Lansbergen //...
C++ :: typedef As Data Type For Specialized Template Function In Class From Shared Library Jul 19, 2013 I have a class "Result" with a single template function Set(const std::string& arName, T& val) and a specialization of this function Set<Real>(const std::string& arName, Real& val...
As to your basic question about whether to place the serial port code into the Form1 class or the main() function, I would say the correct answer is neither. You should make yourself a new class, say Serial, to do this work. You should make an object of this class a member of ...