首页 > 解决方案 > 从成员函数返回 boost iterator_range

问题描述

我正在尝试创建一个返回数组范围的成员函数,如下所示:

#include <boost/range/iterator_range.hpp>

class MyClass {
public:
    boost::iterator_range< double* > range() const{ 
    boost::iterator_range< double* > itr_range = boost::make_iterator_range< double* >(&container[0], &container[m_size]);
    return itr_range;
 }
private:
    double container[4] {0.0, 1.0, 2.0, 3.0}; 
    size_t m_size = 4;
};

int main() {
   MyClass obj;   

   return 0;
}

但它给出了以下错误:

no matching function for call to 'make_iterator_range(const double*, const double*)' main.cpp line 6

'double*' is not a class, struct, or union type range_test      line 37, external location: /usr/include/boost/range/const_iterator.hpp 

'double*' is not a class, struct, or union type range_test      line 37, external location: /usr/include/boost/range/mutable_iterator.hpp   

required by substitution of 'template<class Range> boost::iterator_range<typename boost::range_iterator<C>::type> boost::make_iterator_range(Range&, typename boost::range_difference<Left>::type, typename boost::range_difference<Left>::type) [with Range = double*]'    range_test      line 616, external location: /usr/include/boost/range/iterator_range.hpp


 required by substitution of 'template<class Range> boost::iterator_range<typename boost::range_iterator<const T>::type> boost::make_iterator_range(const Range&, typename boost::range_difference<Left>::type, typename boost::range_difference<Left>::type) [with Range = double*]'   range_test      line 626, external location: /usr/include/boost/range/iterator_range.hpp    

这里可能有什么问题?在此先感谢您的帮助?

标签: c++boostiteratoriterator-range

解决方案


常数是问题。

你的range方法是const

&container[0]insideconst方法的类型是什么?它是const double*。它不匹配

boost::make_iterator_range< double* >
                            ^^^^^^^^

所以将range成员函数定义为非常量或使用boost::make_iterator_range< const double*>


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