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Juggling6743's questions

Martin Hope
Juggling6743
Asked: 2025-02-18 18:22:15 +0800 CST
  • 5

我正在尝试使用带有自定义结构 a 键的 unordered_map。我从其他帖子中知道，我需要定义自定义哈希函数和比较函数。我的问题如下：编译STATIC和SHARED库均无错误。但在执行时，test_exec当我构建库时出现以下错误STATIC：

AddressSanitizer:DEADLYSIGNAL
=================================================================
==19573==ERROR: AddressSanitizer: FPE on unknown address 0x561e54882917 (pc 0x561e54882917 bp 0x7ffea9e6f580 sp 0x7ffea9e6f580 T0)
    #0 0x561e54882917 in std::__detail::_Mod_range_hashing::operator()(unsigned long, unsigned long) const (/home/TEST/minimal_example/build_DEBUG/test_exec+0x4917)
    #1 0x561e5488855f in std::__detail::_Hash_code_base<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, test::MyEnum>, std::__detail::_Select1st, std::hash<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, true>::_M_bucket_index(unsigned long, unsigned long) const (/home/TEST/minimal_example/build_DEBUG/test_exec+0xa55f)
AddressSanitizer:DEADLYSIGNAL
AddressSanitizer: nested bug in the same thread, aborting

我怎样才能让它为STATIC图书馆服务？

测试库

#ifndef TEST_LIB_H
#define TEST_LIB_H

#include <string>
#include <unordered_map>

namespace test {

enum class MyEnum { A, B, C, D };

using enum MyEnum;
const std::unordered_map<std::string, MyEnum> string_to_enum = {
    {"A", A},
    {"B", B},
    {"C", C},
    {"D", D},
};
const std::unordered_map<MyEnum, std::string> enum_to_string = {
    {A, "A"},
    {B, "B"},
    {C, "C"},
    {D, "D"},
};

struct MyStruct {
  MyEnum my_enum;
  unsigned int num;

  bool operator==(const MyStruct &other) const {
    return (my_enum == other.my_enum) && (num == other.num);
  }
};

struct MyStructHash {
  std::size_t operator()(const MyStruct &s) const {
    return std::hash<MyEnum>{}(s.my_enum) ^
           (std::hash<unsigned int>{}(s.num) << 1);
  }
};

using MyMap = std::unordered_map<MyStruct, double, MyStructHash>;
MyMap get_map();
const MyMap MAP = get_map();

} // namespace test

#endif

测试库.cpp

#include "test_lib.h"

namespace test {
MyMap get_map() {

  MyMap map;

  map[MyStruct(string_to_enum.at("A"), 2)] = 4.5;

  return map;
}
} // namespace test

测试执行文件

#include "test_lib.h"
#include <iostream>

using namespace test;
int main(int ac, char **av) {
  auto test = string_to_enum.at("A");

  std::cout << enum_to_string.at(test) << std::endl;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.15)

############################
# project name and version #
############################
project( Test VERSION 0.1 LANGUAGES CXX)

##############################
# set c++ flags and standard #
##############################
set(CMAKE_CXX_STANDARD 20)
set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS} -O0 -Wall -Wextra -Wpedantic -Wconversion -Wdouble-promotion -Wno-unused-parameter -Wno-unused-function -Wno-sign-conversion -fsanitize=address")

add_library(test_lib STATIC test_lib.cpp)
set_target_properties(test_lib PROPERTIES PUBLIC_HEADER test_lib.h)

add_executable(test_exec test_exec.cpp)
target_link_libraries(test_exec PUBLIC 
  test_lib 
  )

到目前为止，我已经构建了这个最小的示例来排除我的代码中的任何其他问题。

编辑：

定义后

extern const MyMap MAP;

在 test_lib.h 和

const MyMap MAP = get_map();

在 test_lib.cpp 中它可以工作。

c++