为什么这个插入到map失败?
我正在使用 Bison 编写一个解析器,并使用映射进行语义评估。 在其中一个函数中,我有以下代码:
map<int, int>* result = new map<int, int>();
map<int, int>::iterator liter;
map<int, int>::iterator riter;
liter = lval.polyMap.begin();
riter = rval.polyMap.begin();
l = liter->first;
r = riter->first;
(*result).insert(l, (booleanCondition()) ? liter->second : -liter->second);
(polyMap 的类型为 map
)。 这给了我以下错误:
/usr/lib/gcc/i686-pc-cygwin/3.4.4/include/c++/bits/stl_tree.h: In member functio
n `void std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::insert_unique(
_II, _II) [with _InputIterator = int, _Key = int, _Val = std::pair<const int, in
t>, _KeyOfValue = std::_Select1st<std::pair<const int, int> >, _Compare = std::l
ess<int>, _Alloc = std::allocator<std::pair<const int, int> >]':
/usr/lib/gcc/i686-pc-cygwin/3.4.4/include/c++/bits/stl_map.h:397: instantiated
from `void std::map<_Key, _Tp, _Compare, _Alloc>::insert(_InputIterator, _Input
Iterator) [with _InputIterator = int, _Key = int, _Tp = int, _Compare = std::les
s<int>, _Alloc = std::allocator<std::pair<const int, int> >]'
polynom.ypp:147: instantiated from here
/usr/lib/gcc/i686-pc-cygwin/3.4.4/include/c++/bits/stl_tree.h:996: error: invali
d type argument of `unary *'
其中 polynom.ypp 第 147 行包含 (*result).insert(l, (booleanCondition()) ? litre->second : -liter->second);
有什么问题吗?
I'm writing a parser using Bison, and am using a map for semantic evaluation.
In one of the functions I have the following code:
map<int, int>* result = new map<int, int>();
map<int, int>::iterator liter;
map<int, int>::iterator riter;
liter = lval.polyMap.begin();
riter = rval.polyMap.begin();
l = liter->first;
r = riter->first;
(*result).insert(l, (booleanCondition()) ? liter->second : -liter->second);
(polyMap is of type map<int, int>
).
And this gives me the following errors:
/usr/lib/gcc/i686-pc-cygwin/3.4.4/include/c++/bits/stl_tree.h: In member functio
n `void std::_Rb_tree<_Key, _Val, _KeyOfValue, _Compare, _Alloc>::insert_unique(
_II, _II) [with _InputIterator = int, _Key = int, _Val = std::pair<const int, in
t>, _KeyOfValue = std::_Select1st<std::pair<const int, int> >, _Compare = std::l
ess<int>, _Alloc = std::allocator<std::pair<const int, int> >]':
/usr/lib/gcc/i686-pc-cygwin/3.4.4/include/c++/bits/stl_map.h:397: instantiated
from `void std::map<_Key, _Tp, _Compare, _Alloc>::insert(_InputIterator, _Input
Iterator) [with _InputIterator = int, _Key = int, _Tp = int, _Compare = std::les
s<int>, _Alloc = std::allocator<std::pair<const int, int> >]'
polynom.ypp:147: instantiated from here
/usr/lib/gcc/i686-pc-cygwin/3.4.4/include/c++/bits/stl_tree.h:996: error: invali
d type argument of `unary *'
Where polynom.ypp line 147 contains (*result).insert(l, (booleanCondition()) ? liter->second : -liter->second);
What's the problem?
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您可能需要调用
(*result).insert(make_pair(l, (booleanCondition()) ? litre->second : -liter->second));
You might want to call
(*result).insert(make_pair(l, (booleanCondition()) ? liter->second : -liter->second));