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c++之内存分配、命名空间、强制类型转换学习总结

一、C++动态内存分配：在学习c语言的时候，我们一般都是使用库函数malloc（）来进行内存的申请分配，然后使用库函数free()来进行释放申请到的内存；现在在c++里面采用了另外一种内存申请的方法：...char *pc =&pc; ^ t.cpp:11:29: error: invalid static_cast from type ‘int*’ to type...int z = const_cast(x); ^ t.cpp:18:6: error: assignment of read-only...char(i); ^ t.cpp:12:30: error: invalid cast from type ‘int’ to type ‘char...target is not pointer or reference to class) char *pc =dynamic_castchar*>(pi); 不符合规则，所以报错。

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如何写出优雅的C++代码

* ct = (char*)malloc(323); return 0; } 这是使用clang-tidy的检测结果： ~/test$ clang-tidy -checks=* test_lint.cpp.../test/test_lint.cpp:20:5: warning: use auto when initializing with a cast to avoid duplicating the type...: C-style casts are discouraged; use static_cast [google-readability-casting] char* ct = (char*)malloc.../test_lint.cpp:20:16: warning: do not use C-style cast to convert between unrelated types [cppcoreguidelines-pro-type-cstyle-cast...or a smart pointer [cppcoreguidelines-no-malloc] char* ct = (char*)malloc(323);

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4.移植驱动到3.4内核-移植总结

elv_next_request()函数 6) bool __blk_end_request_cur(struct request *rq, int error) 作用:用来完成当前获取的request结构体(具体使用参考...: assignment makes pointer from integer without a cast first_drv.c:155: error: implicit declaration...of function 'class_device_create' first_drv.c:155: warning: assignment makes pointer from integer without...a cast first_drv.c:160: warning: assignment makes pointer from integer without a cast first_drv.c:...3)装载试验 insmod cfbcopyarea.ko insmod cfbfillrect.ko insmod cfbimgblt.ko insmod 9th_lcd.ko 使用echo

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clang_intprt_t类型探究

: initialization makes integer from pointer without a cast [enabled by default] int p = &a; ~$ ....: initialization makes integer from pointer without a cast [-Wint-conversion] int p = &a;...^ test.c:5:35: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast] printf...from integer of different size [-Wint-to-pointer-cast] printf("the result is %d\n",*((int*)p));...from pointer to smaller type uint32_t” error in Clang Why is “cast from ‘X*’ to ‘Y’ loses precision”

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原利用系统缓存提高PostgreSQL操作效率

: implicit declaration of function ‘heap_form_tuple’ pgfincore.c:227: warning: assignment makes pointer...from integer without a cast pgfincore.c: In function ‘pgfadvise’: pgfincore.c:477: warning: assignment...makes pointer from integer without a cast pgfincore.c: In function ‘pgfadvise_loader’: pgfincore.c:710...: warning: assignment makes pointer from integer without a cast pgfincore.c: In function ‘pgfincore’:...pgfincore.c:1016: warning: assignment makes pointer from integer without a cast gcc -Wall -Wmissing-prototypes

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故障分析 | 命令行登录 MySQL 报 Segmentation fault 故障解决

: initialization of ‘ char * ’ from ‘ int ’ makes pointer from integer without a cast [-Wint-conversion...Pass a null pointer for the argument area, and tgetstr will use malloc to allocate storage big enough...^~~ foo.c:7:15: warning: initialization of ‘char *’ from ‘int’ makes pointer from integer without a...cast [-Wint-conversion] 执行结果: $ ....这里涉及到 linux 系统中进程的地址空间里的堆(Heap)和栈(Stack)的概念，malloc 分配出来的内存是放在堆上，terminal_set 方法中的 char bufTC_BUFSIZE是放在栈上

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C++的四种强制转换

It can also cast pointers to or from integer types....The format in which this integer value represents a pointer is platform-specific....The only guarantee is that a pointer cast to an integer type large enough to fully contain it (such as..., not only upcasts (from pointer-to-derived to pointer-to-base), but also downcasts (from pointer-to-base...But dynamic_cast can also downcast (convert from pointer-to-base to pointer-to-derived) polymorphic classes

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C++核心准则ES.64：使用T{e}记法构造对象

void use(char ch, int i, double d, char* p, long long lng) { int x1 = int{ch}; // OK, but redundant...{p}; // error: pointer to->int; use a reinterpret_cast if you really need to int x4 = int{lng...int y3 = int(p); // bad: pointer to->int; use a reinterpret_cast if you really need to int y4...int z4 = (int)lng; // bad: long long->int narrowing; use a cast if you need to } The integer to/from...between platforms with different integer and pointer sizes.

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MSVC std::any 源码解析

std::any 介绍 std::any 是 c++17 标准新提供的类，作用是存储任意类型的一段内存，并可以重复赋值，在赋值后可以使用 std::any_cast 将 std::any 所存储的值转换成特定类型.../ thrown by failed any_cast public: _NODISCARD virtual const char* __CLR_OR_THIS_CALL what() const...再看其余部分就很简单了，首先是析构和 operator=： ~any() noexcept { reset(); } // Assignment [any.assign] any& operator...a value of type _Decayed, return a pointer to it return const_cast(static_cast any&& _Any -> remove_cv_t 总结起来就是入参的 std::any 为指针时，返回指针，否则返回 remove_cv_t，所以使用时如果对应的是结构体

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过五关斩六将开发属于自己的JDK

JDK仍旧是JDK8的版本，随着时间的推移越来越多的开源框架最新版本已经不支持JDK8，了解JDK新特性是比较有利于后续升级使用的。...to smaller integer type 'MIDIClientRef' (aka 'unsigned int') from 'void *' [-Werror,-Wvoid-pointer-to-int-cast...to smaller integer type 'MIDIPortRef' (aka 'unsigned int') from 'void *' [-Werror,-Wvoid-pointer-to-int-cast...to smaller integer type 'MIDIPortRef' (aka 'unsigned int') from 'void *' [-Werror,-Wvoid-pointer-to-int-cast...to smaller integer type 'MIDIEndpointRef' (aka 'unsigned int') from 'void *' [-Werror,-Wvoid-pointer-to-int-cast

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python3+arcface2.0 离

),('BuildDate',c_char_p),('CopyRight',c_char_p)] #单人人脸信息人脸狂,人脸角度 class ASF_SingleFaceInfo(Structure...(c_ubyte) #激活 jihuo=dll.ASFActivation jihuo.restype = c_int32 jihuo.argtypes = (c_char_p,c_char_p) #...(ASF_FaceFeature),POINTER(ASF_FaceFeature),POINTER(c_float)) malloc = dllc.malloc free = dllc.free memcpy...= dllc.memcpy malloc.restype = c_void_p malloc.argtypes = (c_size_t, ) free.restype = None free.argtypes...(im): faces=face_class.ASF_MultiFaceInfo() img=im.data imgby=bytes(im.data) imgcuby=cast

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使用SoudTouch实现变速变调

//声道数 int channels =2; //变调 float pitch= 1.0f; //变数 float speed= 1.0f; //采样位数 SoudTouch最低支持16bit，所以使用...(malloc(BUFF_SIZE)); soundTouch = new SoundTouch(); soundTouch->setSampleRate(sample_rate...//#define SOUNDTOUCH_INTEGER_SAMPLES 1 //integer samples #define SOUNDTOUCH_FLOAT_SAMPLES...1 //< 32bit float samples #endif 根据你的类型注释选择对应的宏定义即可 ffmpeg里面使用的时候需要注意的点：因为FFmpeg解码出来的...(malloc(BUFF_SIZE)); soundTouch = new SoundTouch(); soundTouch->setSampleRate(sample_rate

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LLVM异常实现二 libcxxabi

size_t header_offset = get_cxa_exception_offset(); char *raw_buffer = (char *)__aligned_malloc_with_fallback...malloc malloc的size是包含了header_offset以及实际分配的整个size。...(size); } 这里使用了标准库的align_alloc 关于fallback则是标准库分配失败的情况下的备选方法 void* fallback_malloc(size_t len) { heap_node...size_t header_offset = get_cxa_exception_offset(); char *raw_buffer = ((char *)cxa_exception_from_thrown_object...static inline __cxa_exception* cxa_exception_from_thrown_object(void* thrown_object) { return static_cast

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C++ 中的类型转换：深入理解 static_cast 与 C风格转换的本质区别

(From*from){//检查是否是指针到指针的转换static_assert(std::is_pointer_v&&std::is_pointer_vFrom>,"simple_static_cast_ptr...安全性保障收起代码语言：C++运行AI代码解释float*f=static_cast(malloc(100));//编译错误！...//正确做法，需要显式经过void*：void*ptr=malloc(100);float*f=static_cast(ptr);编译器会捕获不合理的转换，避免潜在错误。...&&std::is_pointer_vFrom>){//指针到指针的转换static_assert(std::is_convertible_vFrom,To>,"Invalidpointerconversion...核心建议：优先使用static_cast而非C风格转换避免使用static_cast进行向下转换，优先考虑dynamic_cast不要使用static_cast移除const限定符，这是const_cast

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C++ 中文周刊第109期

有概率能进 RCU和Hazard pointer讨论好久了。感觉也是早晚的事。...Ts> auto fn() -> void { foo foo{}; show_types(typename_cast(foo)); // tefoo.long...感觉很厉害 MLIR源码分析(一)：基本数据结构 MLIR走读今年在C/C++中踩得最意外的一个坑自己用数组做内存池，然后重载new aligned_malloc，结果地址并没有aligned，原因...，数组没对齐 C++ RTTI和LLVM RTTI使用方法和原理解析打通游戏服务端框架的C++20协程改造的最后一环在已有库上拓展c++20协程玩法，代码演进上的一些设计分析RTTI...constexpr能用就用 Vectors and unique pointers 使用unique_ptr和vector会遇到个坑爹的问题，从initializer_list 构造的没法move，坑爹

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static_cast, dynamic_cast, reinterpret_cast, const_cast区别

= const_castchar *> (c) ; 13 Print(cc); 14 return 0; 15 } 从char *cc = const_castchar *>(c)可以看出了这个转换的作用了...在应用多态编程时，当我们无法确定传过来的对象的实际类型时使用dynamic_cast，如果能保证对象的实际类型，用static_cast就可以了。...当写C++（程序）时，有时候我们在使用static_cast和reinterpret_cast时可能会有点模糊。...(pf);简而言之，static_cast 将尝试转换，举例来说，如float-到-integer，而reinterpret_cast简单改变编译器的意图重新考虑那个对象作为另一类型...指针类型（Pointer Types）指针转换有点复杂，我们将在本文的剩余部分使用下面的类： class CBaseX { public: int

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Smart Pointer Programming Techniques

(char const * name, char const * mode); void fread(FILE * f, void * data, size_t size); void fclose(FILE...{ ... } }; file::file(char const * name, char const * mode): pimpl_(new impl(name, mode)) { } void...pimpl_->read(data, size); } The key thing to note here is that the compiler-generated copy constructor, assignment...Preventing delete px.get() It is often desirable to prevent client code from deleting a pointer that...A shared_ptr can later be cast back to the correct type by using static_pointer_cast.

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记64位地址截断引发的挂死问题

原因也很简单，32位寻址范围有限，能使用的最大内存也是非常有限的，因此需要使其能够支持64位，这个过程需要修改编译工程，编译第三方库为64位，修改代码等等。...实际上前面的示例程序在编译的时候就有警告： main.c: In function ‘main’: main.c:11:9: warning: implicit declaration of function...‘testFun’ [-Wimplicit-function-declaration] p = testFun(); ^ main.c:11:7: warning: assignment...makes pointer from integer without a cast [-Wint-conversion] p = testFun(); ^ 两个警告的意思分别为...本文总结如下：不要忽略任何一个警告，除非你非常清楚地知道自己在做什么在头文件中声明函数，并提供给调用者函数使用前进行声明问题长期定位不出来时，休息一下尽量编写通用性代码非必要时不强转使用void

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关于intptr_t，uintptr_t类型

位数 char short int long 指针 16 1个字节8位 2个字节16位 2个字节16位 4个字节32位 2个字节16位 32 1个字节8位 2个字节16位 4个字节32位 4个字节32位...,sizeof(p):%ld\n",sizeof(ptr),sizeof(p)); return 0; } 其实，在编译的时候GCC就已经给出了警告，Wpointer-to-int-cast...test.c: In function ‘main’: test.c:13:12: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast

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c++之内存分配、命名空间、强制类型转换学习总结

如何写出优雅的C++代码

4.移植驱动到3.4内核-移植总结

clang_intprt_t类型探究

原利用系统缓存提高PostgreSQL操作效率

故障分析 | 命令行登录 MySQL 报 Segmentation fault 故障解决

C++的四种强制转换

C++核心准则ES.64：使用T{e}记法构造对象

MSVC std::any 源码解析

过五关斩六将开发属于自己的JDK

python3+arcface2.0 离

使用SoudTouch实现变速变调

LLVM异常实现二 libcxxabi

C++ 中的类型转换：深入理解 static_cast 与 C风格转换的本质区别

C++ 中文周刊第109期

static_cast, dynamic_cast, reinterpret_cast, const_cast区别

Smart Pointer Programming Techniques

记64位地址截断引发的挂死问题

关于intptr_t，uintptr_t类型

推荐一个优秀的c++源代码，TinyXml2

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