传递给函数：const std :: vector＆xv：
std::vector<float>::iterator lowBound = lower_bound(xv.begin(), xv.end(), x);
在将std::vector<float>&更改为const std::vector<float>&之前，该功能运行良好
Lower_bound在编译时返回语法错误，提示：
no suitable user-defined conversion from "__gnu_cxx::__normal_iterator<const float *, std::vector<float, std::allocator<float>>>" to "__gnu_cxx::__normal_iterator<float *, std::vector<float, std::allocator<float>>>" exists
std::vector<...>::const_iterator std::lower_bound<std::vector<float, std::allocator<float>>::const_iterator, float>(std::vector<...>::const_iterator __first, std::vector<...>::const_iterator __last, const float &__val)
我尝试将std::vector<float>::iterator更改为const std::vector<float>::iterator，也尝试了std::vector<const float>::iterator。
这些选项似乎都不起作用。
很抱歉给我带来麻烦，我尝试搜索该错误并且无法给出答案。
答案 0 :(得分：0)
lower_bound返回一个const_iterator。您需要
std::vector<float>::const_iterator lowBound = lower_bound(xv.begin(), xv.end(), x);
或者只是（C ++ 11）
auto lowBound = lower_bound(xv.begin(), xv.end(), x);
答案 1 :(得分：0)
显然我应该使用：
update legheader
set lgh_extrainfo1 = (
Select Case
When L.lgh_split_flag <> 'N' and L.lgh_carrier = 'UNKNOWN'
Then
Case
When
TR.trc_type1 = 'O/O' and TR.trc_type3 = '70Per'
Then CAST (.7 * ((Cast (L.lgh_miles as decimal (10,2))/O.ord_totalmiles) * L.lgh_ord_charge)as decimal (10,2))
When
TR.trc_type1 = 'O/O' and TR.trc_type3 <> '70Per'
Then CAST (.64 * ((Cast (L.lgh_miles as decimal (10,2))/O.ord_totalmiles) * L.lgh_ord_charge)as decimal (10,2))
END
When L.lgh_split_flag = 'N' and L.lgh_carrier = 'UNKNOWN'
Then
Case
When
TR.trc_type1 = 'O/O' and TR.trc_type3 = '70Per'
Then CAST (.7 * L.lgh_ord_charge as decimal (10,2))
When
TR.trc_type1 = 'O/O' and TR.trc_type3 <> '70Per'
Then CAST (.64 * L.lgh_ord_charge as decimal (10,2))
END
End
From Legheader L Left Join TractorProfile TR on L.lgh_tractor = TR.trc_number
Left Join Orderheader O on O.ord_hdrnumber = L.ord_hdrnumber)
而不是const std::vector<float>::const_iterator。
不知道有单独的数据类型。
所以答案是：std::vector<float>::iterator