错误：与"运算符<<"不匹配(操作数类型为"std：：ostream" {aka 'std：：basic_ostream<char>'}

error: no match for ‘operator<<’ (operand types are ‘std::ostream’ {aka ‘std::basic_ostream<char>’}

本文关键字：lt std ostream aka basic char gt 类型 运算符 不匹配 错误      更新时间：2024-05-09

monte_carlo.hpp上的代码是：

class Histogramme{
protected:
std::vector<double> echantillon;
unsigned int nb_boxes;
double lbound;
double ubound;
double box_width;
public:
Histogramme(double min_intervalle, double max_intervalle, unsigned int n) : nb_boxes(n), lbound(min_intervalle),
ubound(max_intervalle), box_width((max_intervalle - min_intervalle)/n),echantillon(n) {}
Histogramme& operator+=(double x);
Histogramme& operator/=(double n);
friend std::ostream& operator<<(std::ostream&, const Histogramme &);
};

在monte_carlo.cpp中：

std::ostream& operator<<(std::ostream& o,const Histogramme& H){
for(int i=0; i<H.echantillon.size(); i++){ o << H.echantillon.size() << std::endl;}
return o;
}

我不明白为什么运营商<lt；当我删除直方图参数处的"const"时，它不起作用，错误是：

错误：与'operator<不匹配<'(操作数类型为"std:：ostream"｛aka"std:：basic_stream"｝和"std：：vector:：size_type"｛aka"long unsigned int"｝(

我从友元函数和函数声明中的Histogram参数中删除了"const"，错误消息不再存在

伟大的

但我收到错误消息"error:'std:：vector Histogram:：sample'在此上下文中受到保护">

无论有没有const，我都没有收到任何错误。这是我写的：

#include <iostream>
#include <vector>
//using namespace std;
class Histogramme {
protected:
std::vector<double> echantillon;
unsigned int nb_boxes;
double lbound;
double ubound;
double box_width;
public:
Histogramme(double min_intervalle, double max_intervalle, unsigned int n) : 
nb_boxes(n), lbound(min_intervalle),
ubound(max_intervalle), box_width((max_intervalle - min_intervalle) / n), echantillon(n) {}
Histogramme& operator+=(double x)
{
;
}
Histogramme& operator/=(double n)
{
;
}
friend std::ostream& operator<<(std::ostream&, Histogramme&);
};
std::ostream& operator<<(std::ostream& o, Histogramme& H) {
for (int i = 0; i < H.echantillon.size(); i++)
{
o << H.echantillon.size() << std::endl;
}
return o;
}
int main()
{
Histogramme example(0.3, 34.2, 5);
std::cout << example << std::endl;
return 0;
}

https://godbolt.org/z/HaQQR-

相关文章：