在 Objective-C++ -> EXC_BAD_ACCESS Error 中使用"new"关键字
Using "new" keyword in Objective-C++ -> EXC_BAD_ACCESS Error
在编译器设置为 objective-c++ 的.mm文件上尝试在运行时使用new关键字动态分配 c++ 类对象时，我不知何故遇到了EXC_BAD_ACCESS错误。任何帮助或指导将不胜感激！当我在其本机 c++ 项目文件中运行此游戏时，我没有遇到任何问题。
#import "GameCode.h"
#include <cstdlib>
#include <chrono>
#include <cassert>
#include <fstream>
#include <iostream>
#import <GameKit/GameKit.h>
#import "GameKitHelper.h"
#import "CardView.h"
#import "MainFunctions.hpp"
@interface GameCode ()<GameKitHelperDelegate>
{
MainFunctions Main;
}
@property (weak, nonatomic) IBOutlet UIView *cardContainerView;
@end
@implementation GameCode
- (void)viewDidLoad
{
// Do any additional setup after loading the view.
}
- (void)viewDidAppear:(BOOL)animated {
[super viewDidLoad];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(playerAuthenticated)
name:LocalPlayerIsAuthenticated object:nil];
[super viewDidAppear:animated];
Pack *pack = new Pack;// delete after game
//Pack *pack = Pack_Maker();
//Pack *pack = [Pack new];
//Pack *pack = [[Pack alloc] init];
默认包构造函数
Pack::Pack()
: next(0)
{
for (int i = 0; i < PACK_SIZE ; i++)
{
for(int j = 0; j < NUM_SUITS ; j++)
{
//K=7 TO k =0
for(int k = 0; k < NUM_RANKS; k++)
{
cards[i] = Card(RANK_NAMES_BY_WEIGHT[k], SUIT_NAMES_BY_WEIGHT[j]);
cards[i].get_value();
i++;
}
}
}
}
// Suits in order from lowest suit to highest suit.
constexpr const char* const SUIT_NAMES_BY_WEIGHT[] = {
Card::SUIT_SPADES,
Card::SUIT_HEARTS,
Card::SUIT_CLUBS,
Card::SUIT_DIAMONDS
};
使用的卡构造函数
Card::Card(const std::string &rank_in, const std::string &suit_in)
: rank(rank_in), suit(suit_in) {}
我什至尝试制作一个函数来为我动态分配它，但没有奏效。错误的访问错误似乎发生在默认卡分配运算符Card::operator=中，因此我尝试创建自定义分配运算符，但问题仍然存在。
/*
Card & Card::operator=(const Card &that)
{
this->rank = that.get_rank();
this->suit = that.get_suit();
return *this;
}
*/
下面是从Card::operator=到致命错误的线程跟踪char_traits<char>::assign:
`Card::operator=:
0x1090682a0 <+0>: pushq %rbp
0x1090682a1 <+1>: movq %rsp, %rbp
0x1090682a4 <+4>: subq $0x30, %rsp
0x1090682a8 <+8>: movq %rdi, -0x8(%rbp)
0x1090682ac <+12>: movq %rsi, -0x10(%rbp)
0x1090682b0 <+16>: movq -0x8(%rbp), %rax
0x1090682b4 <+20>: movq -0x10(%rbp), %rcx
0x1090682b8 <+24>: movl (%rcx), %edx
0x1090682ba <+26>: movl %edx, (%rax)
0x1090682bc <+28>: movq %rax, %rcx
0x1090682bf <+31>: addq $0x8, %rcx
0x1090682c6 <+38>: movq -0x10(%rbp), %rsi
0x1090682ca <+42>: addq $0x8, %rsi
0x1090682d1 <+49>: movq %rcx, %rdi
0x1090682d4 <+52>: movq %rax, -0x18(%rbp)
0x1090682d8 <+56>: callq 0x1090688f0 ; std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >::operator= at string:2303
-> 0x1090682dd <+61>: movq -0x18(%rbp), %rcx
`std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >::operator=:
0x1090688f0 <+0>: pushq %rbp
0x1090688f1 <+1>: movq %rsp, %rbp
0x1090688f4 <+4>: subq $0x20, %rsp
0x1090688f8 <+8>: movq %rdi, -0x8(%rbp)
0x1090688fc <+12>: movq %rsi, -0x10(%rbp)
0x109068900 <+16>: movq -0x8(%rbp), %rax
0x109068904 <+20>: movq -0x10(%rbp), %rsi
0x109068908 <+24>: movq %rax, %rdi
0x10906890b <+27>: movq %rax, -0x20(%rbp)
0x10906890f <+31>: callq 0x109068920 ; std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >::__move_assign at string:2291
-> 0x109068914 <+36>: movq -0x20(%rbp), %rax
`std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >::__move_assign:
0x109068920 <+0>: pushq %rbp
0x109068921 <+1>: movq %rsp, %rbp
0x109068924 <+4>: subq $0x30, %rsp
0x109068928 <+8>: movq %rdi, -0x10(%rbp)
0x10906892c <+12>: movq %rsi, -0x18(%rbp)
0x109068930 <+16>: movq -0x10(%rbp), %rax
0x109068934 <+20>: movq %rax, %rdi
0x109068937 <+23>: movq %rax, -0x20(%rbp)
0x10906893b <+27>: callq 0x109068990 ; std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >::__clear_and_shrink at string:3819
-> 0x109068940 <+32>: movq -0x18(%rbp), %rdi
`std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >::__clear_and_shrink:
0x109068990 <+0>: pushq %rbp
0x109068991 <+1>: movq %rsp, %rbp
0x109068994 <+4>: subq $0x20, %rsp
0x109068998 <+8>: movq %rdi, -0x8(%rbp)
0x10906899c <+12>: movq -0x8(%rbp), %rax
0x1090689a0 <+16>: movq %rax, %rdi
0x1090689a3 <+19>: movq %rax, -0x10(%rbp)
0x1090689a7 <+23>: callq 0x109068ac0 ; std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >::clear at string:3061
-> 0x1090689ac <+28>: movq -0x10(%rbp), %rdi
`std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >::clear:
0x109068ac0 <+0>: pushq %rbp
0x109068ac1 <+1>: movq %rsp, %rbp
0x109068ac4 <+4>: subq $0x20, %rsp
0x109068ac8 <+8>: movq %rdi, -0x8(%rbp)
0x109068acc <+12>: movq -0x8(%rbp), %rax
0x109068ad0 <+16>: movq %rax, %rdi
0x109068ad3 <+19>: movq %rax, -0x18(%rbp)
0x109068ad7 <+23>: callq 0x109068ce0 ; std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >::__invalidate_all_iterators at string:1684
0x109068adc <+28>: jmp 0x109068ae1 ; <+33> at string
0x109068ae1 <+33>: movq -0x18(%rbp), %rdi
0x109068ae5 <+37>: callq 0x109068b60 ; std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >::__is_long at string:1420
0x109068aea <+42>: testb $0x1, %al
0x109068aec <+44>: jne 0x109068af7 ; <+55> at string
0x109068af2 <+50>: jmp 0x109068b22 ; <+98> at string
0x109068af7 <+55>: movq -0x18(%rbp), %rdi
0x109068afb <+59>: callq 0x109068bf0 ; std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >::__get_long_pointer at string:1499
0x109068b00 <+64>: movb $0x0, -0x9(%rbp)
0x109068b04 <+68>: movq %rax, %rdi
0x109068b07 <+71>: leaq -0x9(%rbp), %rsi
0x109068b0b <+75>: callq 0x109068cf0 ; std::__1::char_traits<char>::assign at __string:208
-> 0x109068b10 <+80>: xorl %ecx, %ecx
`std::__1::char_traits<char>::assign:
0x109068cf0 <+0>: pushq %rbp
0x109068cf1 <+1>: movq %rsp, %rbp
0x109068cf4 <+4>: movq %rdi, -0x8(%rbp)
0x109068cf8 <+8>: movq %rsi, -0x10(%rbp)
0x109068cfc <+12>: movq -0x10(%rbp), %rax
0x109068d00 <+16>: movb (%rax), %cl
0x109068d02 <+18>: movq -0x8(%rbp), %rax
-> 0x109068d06 <+22>: movb %cl, (%rax)
您尚未提供cards和极限常量的声明，但这个循环对我来说看起来很可疑：
for (int i = 0; i < PACK_SIZE ; i++)
{
for(int j = 0; j < NUM_SUITS ; j++)
{
//K=7 TO k =0
for(int k = 0; k < NUM_RANKS; k++)
{
cards[i] = Card(RANK_NAMES_BY_WEIGHT[k], SUIT_NAMES_BY_WEIGHT[j]);
cards[i].get_value();
i++;
}
}
}
我怀疑i超出了您的cards阵列的范围。您将在最外层循环的迭代表达式和最内层循环的主体内部递增i。
假设NUM_SUITS是 4，NUM_RANKS是 13，就像在标准一副牌中一样，此代码将在最外层循环的第一次迭代中分配cards[0]到cards[51]，然后跳过cards[52]并将cards[53]分配给cards[104]、跳过cards[105]等等。
我预计cards的维度可能是NUM_SUITS * NUM_RANKS的倍数，例如 156。在该示例中，您将数组超出 2，而内部循环尝试分配给不存在的cards[156]并cards[157]。
我建议也许将最外层的循环更改为while (i < PACK_SIZE)并在代码中放入一些assert，以确保数组维度和运行索引符合您的期望：
int i = 0;
while (i < PACK_SIZE)
{
assert(i + NUM_SUITS * NUM_RANKS <= cards.size());
for(int j = 0; j < NUM_SUITS ; j++)
{
for(int k = 0; k < NUM_RANKS; k++)
{
cards[i] = Card(RANK_NAMES_BY_WEIGHT[k], SUIT_NAMES_BY_WEIGHT[j]);
cards[i].get_value();
i++;
}
}
}
assert(i <= cards.size());
不用说，如果这段代码是从纯C++项目中逐字获取的，那么错误也存在。
相关文章：
- Visual Studio 2015：Extern "C" 和 "export" 关键字
- "error: no matching function for call to"构造函数错误
- C++中的"inline"关键字
- C++，OpenCV，尝试显示图像时"OpenCV(4.3.0) Error: Assertion failed (size.width>0 && size.height>0)"此错误
- 如何确保C++函数在定义之前声明(如override关键字）
- 使用 LuaBridge 将 LuaJIT 绑定到C++会导致"PANIC: unprotected error"
- OpenMP卸载说'fatal error: could not find accel/nvptx-none/mkoffload'
- C++错误："error: int aaa::bbb is protected within this context"
- 尝试链接我的着色器时，我收到错误代码"error c5145 must write to gl_position"
- 谷歌模拟和覆盖关键字
- C++，在int数组中输入字符串或字符会输出0，而不是ascii或error
- 使用 cmake 的 LLVM 构建在 tsan_libdispatch_mac.cc 期间失败; "Error: conflicting types for ..."
- C++ "error: invalid use of void expression"
- 结构体 S { int align; } 之间的区别;(struct 关键字后的名称）和 struct { int al
- 如果全局变量默认是外部变量，为什么要添加"extern"关键字？
- struct.error:解压缩 C++ 结构时，解包需要 288 字节的缓冲区
- 如何修复"error: ‘_1’ was not declared in this scope"？
- 当我从下面的代码中删除关键字 virtual 时，它可以正常工作，否则会出现错误。在这里"virtual"字的意义是什么？
- 在 Objective-C++ -> EXC_BAD_ACCESS Error 中使用"new"关键字
- 使用 "this" 关键字时的"Error: expression must have a pointer type"
