stl 相关问题

gdb 信息： #0 0x00007f53691c1a4a 在 ?? () 来自 /data/services/lib_glibc/lib/libc.so.6 #1 0x0000000000b59a3c in std::char_traits::compare (__n=, __s2= gdb 信息： #0 0x00007f53691c1a4a in ?? () from /data/services/lib_glibc/lib/libc.so.6 #1 0x0000000000b59a3c in std::char_traits<char>::compare (__n=<optimized out>, __s2=<optimized out>, __s1=<optimized out>) at /usr/include/c++/5/bits/char_traits.h:262 #2 std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::compare (__str=..., this=0xc8ce080) at /usr/include/c++/5/bits/basic_string.h:2318 #3 std::operator< <char, std::char_traits<char>, std::allocator<char> > (__rhs=..., __lhs=...) at /usr/include/c++/5/bits/basic_string.h:4989 #4 std::less<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >::operator() (this=<optimized out>, __y=..., __x=...) at /usr/include/c++/5/bits/stl_function.h:387 #5 std::_Rb_tree<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::_Select1st<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >, std::less<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >::_M_lower_bound (this=<optimized out>, __k=..., __y=0x7f5345b40310, __x=0xc8ce060) at /usr/include/c++/5/bits/stl_tree.h:1628 #6 std::_Rb_tree<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::_Select1st<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >, std::less<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >::lower_bound (__k=..., this=0x7f5345b40308) at /usr/include/c++/5/bits/stl_tree.h:1091 #7 std::map<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::less<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >::lower_bound (__x=..., this=0x7f5345b40308) at /usr/include/c++/5/bits/stl_map.h:916 #8 std::map<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::less<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >::operator[] (__k=..., this=0x7f5345b40308) at /usr/include/c++/5/bits/stl_map.h:479 ... (gdb) f 8 #8 std::map<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::less<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >::operator[] (__k=..., this=0x7f5345b40308) at /usr/include/c++/5/bits/stl_map.h:479 479 iterator __i = lower_bound(__k); (gdb) i args __k = @0xb8f57a8: {static npos = 18446744073709551615, _M_dataplus = {<std::allocator<char>> = {<__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, _M_p = 0xb8f57b8 "bogi-signature"}, _M_string_length = 14, {_M_local_buf = "bogi-signature\000r", _M_allocated_capacity = 7451613697440967010}} this = 0x7f5345b40308 (gdb) f 7 #7 std::map<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::less<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >::lower_bound (__x=..., this=0x7f5345b40308) at /usr/include/c++/5/bits/stl_map.h:916 916 { return _M_t.lower_bound(__x); } (gdb) i args __x = @0xb8f57a8: {static npos = 18446744073709551615, _M_dataplus = {<std::allocator<char>> = {<__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, _M_p = 0xb8f57b8 "bogi-signature"}, _M_string_length = 14, {_M_local_buf = "bogi-signature\000r", _M_allocated_capacity = 7451613697440967010}} this = 0x7f5345b40308 (gdb) f 6 #6 std::_Rb_tree<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::_Select1st<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >, std::less<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >::lower_bound (__k=..., this=0x7f5345b40308) at /usr/include/c++/5/bits/stl_tree.h:1091 1091 { return _M_lower_bound(_M_begin(), _M_end(), __k); } (gdb) i args __k = @0xb8f57a8: {static npos = 18446744073709551615, _M_dataplus = {<std::allocator<char>> = {<__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, _M_p = 0xb8f57b8 "bogi-signature"}, _M_string_length = 14, {_M_local_buf = "bogi-signature\000r", _M_allocated_capacity = 7451613697440967010}} this = 0x7f5345b40308 (gdb) f 5 #5 std::_Rb_tree<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::_Select1st<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >, std::less<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >::_M_lower_bound (this=<optimized out>, __k=..., __y=0x7f5345b40310, __x=0xc8ce060) at /usr/include/c++/5/bits/stl_tree.h:1628 1628 if (!_M_impl._M_key_compare(_S_key(__x), __k)) (gdb) i args this = <optimized out> __k = @0xb8f57a8: {static npos = 18446744073709551615, _M_dataplus = {<std::allocator<char>> = {<__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, _M_p = 0xb8f57b8 "bogi-signature"}, _M_string_length = 14, {_M_local_buf = "bogi-signature\000r", _M_allocated_capacity = 7451613697440967010}} __y = 0x7f5345b40310 __x = 0xc8ce060 代码： for (; hIt != cntl->http_request().HeaderEnd(); hIt++) { this->_ctx._header[hIt->first] = hIt->second; } 这是构造函数的代码。 _ctx 是一个成员类，_header 是一个 std::map 成员变量。 hIt->first 和 hIt->second 返回有效的字符串变量。我通过打印 args 确认了这一点。（用户的deviceid，敏感信息）我检查了很多，但似乎没有什么是对的

c++ stl segmentation-fault stdmap

回答 0 投票 0

C++ STL递归调用时的未定义行为[重复]

在复习 Leetcode 问题时，我想找到充满 0 的子数组。我做了一个递归函数来完成任务，但它抛出了一个错误。类解决方案{ 民众： ...

c++ recursion stl

回答 1 投票 0

像“_M_construct”这样的函数在哪里定义

在Debian上反汇编了一个自己写的非常简单的C++程序。它涉及一些 std::string 操作。在反汇编代码中，我可以看到很多对以下内容的引用：我在Debian上反汇编了一个自己写的非常简单的C++程序。它涉及一些std::string操作。在反汇编代码中，我可以看到很多对以下内容的引用： <void std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_M_construct<char const*>(char const*, char const*, std::forward_iterator_tag)> 我相信这是由一些模板函数创建的具体字符串构造函数来初始化我的字符串。然而，反汇编代码似乎并没有提供关于模板函数的确切定义位置的线索。我查了/usr/include/c++/10/string，我在这里找不到太多。我也问过 ChatGPT，它说它是在libstdc++-10-dev 中定义的，我发布了apt-get source libstdc++-10-dev 以按照它的建议获取来源，但我只找到如下内容，这不是我真正想要的： 18 results - 4 files debian/libcc1-0.symbols: 8 (optional=abi_c++17)_ZNSt6vectorINSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEESaIS5_EE17_M_realloc_insertIJS5_EEEvN9__gnu_cxx17__normal_iteratorIPS5_S7_EEDpOT_@Base 8 9: (optional=abi_c++11)_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE12_M_constructIPKcEEvT_S8_St20forward_iterator_tag@Base 8 10: (optional=abi_c++11)_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE12_M_constructIPcEEvT_S7_St20forward_iterator_tag@Base 8 11 (optional=abi_c++11)_ZNSt6vectorINSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEESaIS5_EED1Ev@Base 10 debian/libstdc++6.symbols.32bit.cxx11: 116 (optional=abi_c++11)_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE11_M_capacityEj@GLIBCXX_3.4.21 5.2 117: (optional=abi_c++11)_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE12_M_constructEjc@GLIBCXX_3.4.21 5.2 118 (optional=abi_c++11)_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE13_M_set_lengthEj@GLIBCXX_3.4.21 5.2 119 (optional=abi_c++11)_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE14_M_replace_auxEjjjc@GLIBCXX_3.4.21 5.2 120: (optional=abi_c++11)_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE18_M_construct_aux_2Ejc@GLIBCXX_3.4.21 5.2 121 (optional=abi_c++11)_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE2atEj@GLIBCXX_3.4.21 5.2 170 (optional=abi_c++11)_ZNSt7__cxx1112basic_stringIwSt11char_traitsIwESaIwEE11_M_capacityEj@GLIBCXX_3.4.21 5.2 171: (optional=abi_c++11)_ZNSt7__cxx1112basic_stringIwSt11char_traitsIwESaIwEE12_M_constructEjw@GLIBCXX_3.4.21 5.2 172 (optional=abi_c++11)_ZNSt7__cxx1112basic_stringIwSt11char_traitsIwESaIwEE13_M_set_lengthEj@GLIBCXX_3.4.21 5.2 173 (optional=abi_c++11)_ZNSt7__cxx1112basic_stringIwSt11char_traitsIwESaIwEE14_M_replace_auxEjjjw@GLIBCXX_3.4.21 5.2 174: (optional=abi_c++11)_ZNSt7__cxx1112basic_stringIwSt11char_traitsIwESaIwEE18_M_construct_aux_2Ejw@GLIBCXX_3.4.21 5.2 175 (optional=abi_c++11)_ZNSt7__cxx1112basic_stringIwSt11char_traitsIwESaIwEE2atEj@GLIBCXX_3.4.21 5.2 debian/libstdc++6.symbols.64bit.cxx11: 116 (optional=abi_c++11)_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE11_M_capacityEm@GLIBCXX_3.4.21 5.2 117: (optional=abi_c++11)_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE12_M_constructEmc@GLIBCXX_3.4.21 5.2 118 (optional=abi_c++11)_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE13_M_set_lengthEm@GLIBCXX_3.4.21 5.2 119 (optional=abi_c++11)_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE14_M_replace_auxEmmmc@GLIBCXX_3.4.21 5.2 120: (optional=abi_c++11)_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE18_M_construct_aux_2Emc@GLIBCXX_3.4.21 5.2 121 (optional=abi_c++11)_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE2atEm@GLIBCXX_3.4.21 5.2 170 (optional=abi_c++11)_ZNSt7__cxx1112basic_stringIwSt11char_traitsIwESaIwEE11_M_capacityEm@GLIBCXX_3.4.21 5.2 171: (optional=abi_c++11)_ZNSt7__cxx1112basic_stringIwSt11char_traitsIwESaIwEE12_M_constructEmw@GLIBCXX_3.4.21 5.2 172 (optional=abi_c++11)_ZNSt7__cxx1112basic_stringIwSt11char_traitsIwESaIwEE13_M_set_lengthEm@GLIBCXX_3.4.21 5.2 173 (optional=abi_c++11)_ZNSt7__cxx1112basic_stringIwSt11char_traitsIwESaIwEE14_M_replace_auxEmmmw@GLIBCXX_3.4.21 5.2 174: (optional=abi_c++11)_ZNSt7__cxx1112basic_stringIwSt11char_traitsIwESaIwEE18_M_construct_aux_2Emw@GLIBCXX_3.4.21 5.2 175 (optional=abi_c++11)_ZNSt7__cxx1112basic_stringIwSt11char_traitsIwESaIwEE2atEm@GLIBCXX_3.4.21 5.2 所以问题是：名字像:_M_construct<char const*>(char const*, char const*, std::forward_iterator_tag)的函数真的存在吗？如果有，我在哪里可以找到它们？如果不是，我怎么知道是哪个模板生成的？ c++filt，它应该与您的 C++ 编译器一起安装，将 demangle 导出的 C++ 符号： c++filt _ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE12_M_constructIPcEEvT_S7_St20forward_iterator_tag 给： void std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >:: _M_construct<char*>(char*, char*, std::forward_iterator_tag) 这就是你要找的。

c++ stl

回答 1 投票 0

我可以在使用它们的指针/引用迭代它们时删除 `vector` 元素吗？

我有一个表示视频游戏中角色的统计修改的结构，以及一个“耗尽”此 buff 回合/阶段的函数： typedef struct CharacterBuff {

c++ vector stl stdvector

回答 0 投票 0

如何反转 C++ 向量？

C++ 中是否有内置向量函数来反转向量？还是您只需要手动完成？

c++ vector stl std

回答 6 投票 0

本身嵌套STL容器N次

有没有办法将STL容器作为模板参数重复n次嵌套在自身中？例子：模板结构内斯特{ 向量<...> my_vec； }; 内部主要（）{