Question

我有头文件。我想将一个地图对象添加到其中一个结构中。所以我加入了

#include<map>

并编译了程序（注意我没有使用我刚刚包含它的地图对象）并且我收到以下错误

/usr/include/c++/4.7/bits/stl_map.h:115:28: error: macro "value_compare" requires 2 arguments, but only 1 given
/usr/include/c++/4.7/bits/stl_map.h:733:45: error: macro "value_compare" requires 2 arguments, but only 1 given
In file included from /usr/include/c++/4.7/map:62:0,
                 from ../optimizer_types.h:16,
                 from ../main.cpp:20:
/usr/include/c++/4.7/bits/stl_multimap.h:115:28: error: macro "value_compare" requires 2 arguments, but only 1 given
/usr/include/c++/4.7/bits/stl_multimap.h:656:45: error: macro "value_compare" requires 2 arguments, but only 1 given
In file included from /usr/include/c++/4.7/map:61:0,
                 from ../optimizer_types.h:16,
                 from ../main.cpp:20:
/usr/include/c++/4.7/bits/stl_map.h:113:11: error: invalid use of non-static data member 'std::map<_Key, _Tp, _Compare, _Alloc>::value_compare::comp'
/usr/include/c++/4.7/bits/stl_map.h:116:4: error: from this location
/usr/include/c++/4.7/bits/stl_map.h:116:9: error: '__c' was not declared in this scope
/usr/include/c++/4.7/bits/stl_map.h:116:12: error: a function call cannot appear in a constant-expression
/usr/include/c++/4.7/bits/stl_map.h:116:12: error: expected ';' at end of member declaration
/usr/include/c++/4.7/bits/stl_map.h:116:14: error: expected unqualified-id before '{' token
/usr/include/c++/4.7/bits/stl_map.h: In member function 'std::map<_Key, _Tp, _Compare, _Alloc>::value_compare std::map<_Key, _Tp, _Compare, _Alloc>::value_comp() const':
/usr/include/c++/4.7/bits/stl_map.h:733:46: error: expected primary-expression before ';' token
In file included from /usr/include/c++/4.7/map:62:0,
                 from ../optimizer_types.h:16,
                 from ../main.cpp:20:
/usr/include/c++/4.7/bits/stl_multimap.h: At global scope:
/usr/include/c++/4.7/bits/stl_multimap.h:113:11: error: invalid use of non-static data member 'std::multimap<_Key, _Tp, _Compare, _Alloc>::value_compare::comp'
/usr/include/c++/4.7/bits/stl_multimap.h:116:4: error: from this location
/usr/include/c++/4.7/bits/stl_multimap.h:116:9: error: '__c' was not declared in this scope
/usr/include/c++/4.7/bits/stl_multimap.h:116:12: error: a function call cannot appear in a constant-expression
/usr/include/c++/4.7/bits/stl_multimap.h:116:12: error: expected ';' at end of member declaration
/usr/include/c++/4.7/bits/stl_multimap.h:116:14: error: expected unqualified-id before '{' token
/usr/include/c++/4.7/bits/stl_multimap.h: In member function 'std::multimap<_Key, _Tp, _Compare, _Alloc>::value_compare std::multimap<_Key, _Tp, _Compare, _Alloc>::value_comp() const':
/usr/include/c++/4.7/bits/stl_multimap.h:656:46: error: expected primary-expression before ';' token

作为一项实验，我将include移动到cpp文件，并且正在正确编译。

可能是什么原因

Answer 1

试试这个：

#ifdef value_compare
#undefine value_compare // std::map header doesn't like this
#endif
#include <map>

它不是很灵活（或漂亮），但它应该让你通过这个:(

编辑：无论哪种方式，问题都不包括map，而是早期的include / code定义了value_compare宏。它是C头吗？（我怀疑C ++会定义一个具有此名称的宏，因为value_compare是C ++标准库的重要组成部分。）

c ++中的map会导致错误

1 个答案: