疑難雜症萬事通 - 關於 gcc enum size ，我們在網路上蒐集到這些相關的討論、資訊與評價

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Allocate to an enum type only as many bytes as it needs for the declared range of possible values. Specifically, the enum type is equivalent to the smallest ...

#2. Compiler Reference Guide: -fshort-enums, -fno-short ... - Keil

The default is -fno-short-enums . That is, the size of an enumeration type is at least 32 bits regardless of the size of the enumerator values. Example. This ...

#3. David Brown - Re: Size of enum‏ - GCC, the GNU Compiler ...

Enum types in C++ can be any integer type big enough to cover the required range. I think most C++ compilers use the smallest integer type that ...

#4. 7.4.1 Size of Enum Types

An enum type is represented by an underlying integer type. The size of the integer type and whether it is signed is based on the range of values of the ...

#5. Specify size used by enum inside struct?

I am working with the PIC24FJ128GA106 microcontroller and compiling with the C30 compiler. I have two enums: typedef enum

#6. How Big Is An Enum? - Embedded.fm

The GCC C compiler will allocate enough memory for an enum to hold any of the values that you have declared. So, if your code only uses ...

#7. HELP: fixing the GCC enum storage size - Google Groups

enumeration storage size from a 32bit integer to a 64bit integer. For example with a -1 and bit31 enumerators in my enum... typedef enum { TESTValueONE = -1,

#8. fshort-enums, -fno-short-enums - ARM Compiler armclang ...

The default is -fno-short-enums . That is, the size of an enumeration type is at least 32 bits regardless of the size of the enumerator values. Example.

#9. #pragma enum - IBM

If the specified storage size is smaller than that required by the range of the enumeration constants, the compiler issues a diagnostic message.

#10. Forcing enum to be of a specific size - EEVblog

in C, is there a way to force an enum to be of a specific size ... gcc: https://gcc.gnu.org/onlinedocs/gcc-3.3/gcc/Type-Attributes.html

#11. How is the default enum size (short or no-short) determined by ...

In the gcc manual, look for implementation-defined behavior. Chapter 4.9. The integer type compatible with each enumerated type (C90 6.5.2.2, C99 and C11 6.7.

#12. new - Molinillo de Mures SL |

User has a control over the size of enumeration variables. First of all your enum isn't available as a variable. Space 22 hours ago · How to easily map c++ ...

#13. AVR micro-optimization: Avr-gcc and --short-enums - The Odd ...

The GCC C compiler will allocate enough memory for an enum to hold any of the values that you have declared. So, if your code only uses values ...

#14. What is the size of enum in C? - Pvillage.org

On a 32-bit processor they can be 32-bits wide or more or less. The GCC C compiler will allocate enough memory for an enum to hold any of the values that you ...

#15. C++ - Size of an enum | Sololearn: Learn to code for FREE!

The size of an enum is the size of the underlying integral type that can hold the biggest enumerated value, usually starts from int(4bytes) , if ...

#16. Enumerations (C++) | Microsoft Docs

This article covers the ISO Standard C++ Language enum type and the scoped (or strongly-typed) enum class type which is introduced in C++11.

#17. The Trouble with gcc's --short-enums Flag - Programmer's ...

Normally GCC compiles enums into a full register width value, like a 32-bit number. The default size of an enum can technically be different ...

#18. The Best and Worst GCC Compiler Flags For Embedded

Due to the nuances of enums in C, never use enums directly in packed structures. Instead use a type with a constant size and assert if the ...

#19. enum.hpp | C++17 compile-time enum reflection library

C++17 compile-time enum reflection library. ... static constexpr const std::array<enum_type, size> values = { /*enum values*/ }; static constexpr const ...

#20. enum sizes across platforms · Issue #262 · nanopb ... - GitHub

8 with a gcc compiler for the MCU and both Visual Studio 2015 and MinGW compilers on the windows machine. On the MCU, an enum is encoded as 1 ...

#21. Specify size of enum? - NXP Community

The size of an enum is compiler-specific and should default to the smallest integral type which is large enough to fit all of the values, but not larger than ...

#22. linux下short的大小,gcc的配置选项如何确定默认枚 ... - CSDN博客

user@host:~$ echo '_Static_assert(4 == sizeof(enum{E}), "enum size is not 4");' | arm-linux-gnueabihf-gcc -fsyntax-only -xc - && echo "OK, ...

#23. CONFUSED WITH SIZE OF enum ? | AVR Freaks

To get smaller enums, you can compile with AVR-GCC's -fshort-enums compile switch to force enums to have elements of the smallest size possible ...

#24. nullptr, enum classes (strongly typed enumerations) and cstdint

Well-defined enum sizes ... A final advantage of enum classes is that you can set the size of your enum--you can use any signed or unsigned integer type. It ...

#25. Better Enums - Clean reflective enums for C++ - GitHub Pages

h> BETTER_ENUM(Channel, int, Red = 1, Green, Blue) Channel c = Channel::_from_string("Red"); const char *s = c._to_string(); size_t n = Channel::_size(); for ( ...

#26. RE: ARM-only [Patch] Allow 4 byte enum size - sourceware.org

GCC's manual has the following to say (this is target-independent): *Warning:* the '-fshort-enums' switch causes GCC to generate code that is ...

#27. What is size of enum in C? - faq-qa.com

On an 8-bit processor, enums can be 16-bits wide . On a 32-bit processor they can be 32-bits wide or more or less. The GCC C compiler will ...

#28. how - size of enum c# - Code Examples

If I recall correctly, an enum is generally the same size as an int; but I thought I read somewhere that (at least in GCC) the compiler can make the enum ...

#29. Re: Specifying "enum" data size - Apple - Lists

I'm using XCode 1.5 and GCC 3.3, and I'm writing in C. The only control available is -fshort-enums ("Short Enumeration Constants") which you ...

#30. Can I define each enum value to be 64 bits wide in C? - Quora

GCC supports -fshort-enums, as an example. It might be possible to specify the size for individual enums, with #pragma or __attribute__, again, ...

#31. Forward declaring an enum in C++ - C++ - 编程技术网 - 手机版

Forward declaration of enums is possible since C++11. Previously, the reason enum types couldn't be forward declared was because the size of the ...

#32. Is the sizeof(enum) == sizeof(int), always? - OStack Q&A ...

This is // implementation defined. assert(sizeof(enum X) ... Using the option --short-enums of GCC, that makes it use the smallest type ...

#33. What is the size of an enum in C? - MicroEducate

If I recall correctly, an enum is generally the same size as an int; but I thought I read somewhere that (at least in GCC) the compiler can ...

#34. enum allocated size - C / C++ - Bytes Developer Community

Hi, If you don't want to read the whole story: I'm asking - Can I force gcc to treat all enums as 2-byte integers?

#35. V1016. The value is out of range of enum values. This causes ...

For example, such compilers are GCC and Clang. MSVC compiler doen't fall into this category, since it calculates the 'enum' size for ...

#36. How many bytes is an enum in C? - QuickAdviser

Why is the size of an enum only 4 bytes? How big should an enum be in GCC? Is it better to always have a zero value in an ...

#37. What is the size of an enum in C? - OGeek

If I recall correctly, an enum is generally the same size as an int; but I thought I read somewhere that (at least in GCC) the compiler can ...

#38. C++ - sizeof(enum) == sizeof(int) 总是吗？ - 无涯教程网

Using the option --short-enums of GCC, that makes it use the smallest type still fitting all the values. int main() { enum X { A = 0 }; enum X ...

#39. Clang uses -fno-short-enum as default while gcc uses -fshort ...

Will it be worth syncing the behavior with gcc? stackoverflow.com · Lundin. How is the default enum size (short or no-short) determined by the ...

#40. C陷阱篇之enum默認長度 - 台部落

enum 型用於定義常量集合，相比#define有一些優勢，如：enum是一種數據類型， ... 使用enum變量，而編譯庫時設置了fshort-enums，則庫內部此enum size ...

#41. c - gcc, enum is not packed as expected - Code Utility

#pragma pack does not affect sizes of data types. It's purpose is to remove padding in structures. With GCC on x86 enums have size of 4 or even 8 bytes some ...

#42. enum size question — oracle-tech

"test.cpp", line 4: Error: c is not within the range of a long or unsigned long. From a quick browse, it appears gcc enums are of type ...

#43. C++ Tutorial => Underlying type (and hence size) of an enum

Therefore, in the above code, T could be int , unsigned int , or short , but not long long , to give a few examples. Note that an enum has the same size (as ...

#44. gcc(1) - Linux manual page - man7.org

Arguments to options that specify a size threshold of some sort may ... Warning: the -fshort-enums switch causes GCC to generate code that ...

#45. How do I set the size of an enumerated type? - NetBurner ...

It took the sizeof a standard C++ enum from 4 to 1. ... Warning: the -fshort-enums switch causes GCC to generate code that is not binary ...

#46. Ubsan load of bool/enum sanitization - Patchwork

See e.g. <http://gcc.gnu.org/ml/gcc-patches/2013-09/msg01162.html> about not being able to check systematically that the size in bytes of a VLA, ...

#47. C++: Get size of enum - Bytefreaks.net

C++: Get size of enum ... From the result it is pretty easy to understand that the size of an enum will grow to 64bit when any of its values is ...

#48. c - Is the sizeof(enum) == sizeof(int), always?

This is // implementation defined. assert(sizeof(enum X) ... In recent versions of GCC, the compiler flag has changed to -fshort-enums .

#49. Pack Enums in C

What's the default size of enums in C? Well it's int. ... In GCC and Clang, there's support for __attribute__ modifiers.

#50. Enumerated types and their interpretation by compilers

Java created the enum type in response to the widespread use of int constants ... Old-style unscoped enums in C++ are not required to have the size of a C++ ...

#51. Size of enum class? (c++) - For Beginners - GameDev.net

From C++ standard: "For an enumeration whose underlying type is not fixed, ... I just dont want the stored array of enums to change size, ...

#52. Enumerations - cppreference.com

applied to the whole enumeration if appears after enum ,; applied to the ... are required (e.g. as a case label or as a non-VLA array size).

#53. Enumerated type - Wikipedia

In computer programming, an enumerated type (also called enumeration, enum, or factor in the R programming language, and a categorical variable in ...

#54. Table of All GCC Warnings - HackMD

Table of All GCC Warnings This table collects all gcc warnings used with C++ ... alloc-size-larger-than= 7.1, all ... deprecated-enum-float-conversion, 11.1.

#55. Get to Know C++11 Scoped and Based Enum Types

C++ enum types pack a set of related constants in an intuitive and ... control over the scope, size, and implicit conversions of enum types.

#56. enum in c, seven important points you should know - Aticleworld

An enum in c is user defined data type and it consists of a set of named constant integer. enum increases the readability and follows the scope rule.

#57. What is C++ Enum, And How to Use Enums in C++ - Simplilearn

C++ enum or enumerations is a user-defined data type that allows you ... is designed to help you instance scale up and grown as Full stack ...

#58. Thread: How to programatically define size of enum?

Maybe some other gurus can provide additional clarifications. The code shown below does not compile for VC6 without warning. GCC 3.2 also issues ...

#59. C 語言:使用enum 作為陣列元素的索引 - 傑克! 真是太神奇了!

#define SIZEOF_ARRAY(arr) (sizeof(arr) / sizeof(arr[0])) enum Color_t { WHITE = 0 , BLACK , GOLD , PINK }; void foo() { static const char ...

#60. C陷阱篇之enum預設長度- IT閱讀

sizeof ( EType2 ) == sizeof( short );. 一些編譯器為節約記憶體可以設定這種“量體裁衣”的策略。如ADS就有圖示選項(enum container always int) ...

#61. C Language Enum Tips & Tricks - Dmitriy Kubyshkin

Luckily modern compilers provide a warning to verify that all enum values are checked inside a switch statement. In GCC and Clang it is enabled via -Wswitch- ...

#62. Compiler Explorer

Source code. #include <iostream> #include "https://raw.githubusercontent.com/Neargye/magic_enum/master/include/magic_enum.hpp" enum class Color : int { RED ...

#63. 包含int和enum == sizeof(int)的typedef结构的大小？ | 码农家园

C/C++: size of a typedef struct containing an int and enum == sizeof(int)?我在Ubuntu(i686)上使用gcc版本4.3.3。我已经编写了一个简化的测试程序 ...

#64. Ode to Enum - Coding Relic

gcc -Wswitch-enum provides a very nice benefit for enums and switch ... of using an enum: by default, an enum is the size of an int.

#65. c - Is the sizeof(enum) == sizeof(int), always? - WuJiGu ...

This is // implementation defined. assert(sizeof(enum X) ... In recent versions of GCC, the compiler flag has changed to -fshort-enums .

#66. Is there a way to find the cardinality (size) of an enum in C++?

values() method to get an array of Enum values then use the length property. public class Main { enum WORKDAYS It provides a number of methods to get ...

#67. Size of bit fields - Code Yarns

The size of the structure having bit fields can wildly vary ... bit field structures that are huge compared to the GCC or clang ones.

#68. Enum Size Question [SOLVED] - c++ - DaniWeb

In Visual Studio you get an error that says "enumeration value is out of 'int' range". I have not yet tried it with other compilers. In gcc 3.4.

#69. C中枚举的大小是多少？ What is the size of an enum in C?

如果我没记错的话，枚举通常与int 大小相同；但我想我在某处读到（至少在GCC 中）编译器可以使枚举保持它们的值所需的任何宽度. 那么，是否有可能有一个64 位宽的枚举 ...

#70. Scoped (class) enums: fundamentals and examples - nextptr

A C++11 scoped enums deep dive and comparison with C++98 unscoped enums. ... void sendMarketOrder(const std::string& ticker, uint32_t size, ...

#71. Specifying size of enum type in C - Newbedev

I believe there is a flag if you are using GCC. -fshort-enums Is there a way to tell your compiler specifically how wide you want your enum to be?

#72. ArmEabiPort - Debian Wiki

GCC preprocessor macros for floating point. Struct packing and alignment. Stack alignment; 64-bit data type alignment; Enum sizes ...

#73. Pepper_31_C_interfaces: pp_macros.h Source File

30 * compilers (such as MS Visual Studio 2008 and older versions of GCC). ... 52 (which should always be valid) if the enum's size is SIZE, and otherwise ...

#74. "enum" members other than the first one should not be ...

Size of bit fields should not exceed the size of their types ... then C/C++ allocates a sequence of integers starting at zero for the first element and ...

#75. sizeof(enum) -- Is it portable? - Allegro.cc

If I use sizeof() for a binary read/write of an enumerated type variable ... Specifically, does GCC implement this consistently on different ...

#76. C++ Core Guidelines: Rules for Enumerations

In this case, you should use a constexpr value. // bad enum { red = 0xFF0000, scale = 4, is_signed = ...

#77. Enforce 32-bit enums with GCC linker - Windows Hex Error ...

Without this flag, I get variable enums (and enforcing the size by adding an additional 0xFFFFFFFF value to each enum is not an option).

#78. Specifying size of enum type in C - Genera Codice

Allocate to an enum type only as many bytes as it needs for the declared range of possible values. Specifically, the enum type is equivalent to the smallest ...

#79. Question: What Is The Size Of Enum? - swift reviewer

How much memory does enum tak; Can enums have method; What is the use of enum keywor; Is enum signed or unsigne; What is the size of this enum in byte ...

#80. ENUM warnings and errors - Programming Questions

The compiler was warning that you are trying to implicitly convert one type to another, when the types are not the same size. An enum rarely ...

#81. [Bug c++/61414] New: enum class bitfield size-checking failure

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61414 --- Comment #1 from Tom Tromey <tromey at gcc dot gnu.org> --- Jonathan pointed out that this is not ...

#82. Is the sizeof(enum) == sizeof(int), always - iTecNote

This is // implementation defined. assert(sizeof(enum X) ... But if you assign a -1 , then GCC choses to use int as the type that X is compatible with

#83. C : Forcer le type d'un enum en C - Developpez.net

De mémoire avec GCC c'est l'option --short-enums. ... sizeof(enum Enum3), sizeof(enum Enum4), sizeof(enum Enum5) ); return 0; } ...

#84. Data types: Struct, Union, Enum, Bit Fields. Preprocessor and ...

Enumerations – enum ... Having two structure variables of the same size, the content can ... the clang and gcc compilers by the __attribute__((packed)).

#85. C陷阱篇之enum默認長度- 碼上快樂

sizeof ( EType2 ) == sizeof( short );. 一些編譯器為節約內存可以設置這種“量體裁衣”的策略。如ADS就有圖示選項(enum container always int)， ...

#86. 列舉(enum) - 岳程式與鍵盤間的故事

列舉(enum)：也有人稱作為"狀態機"，因為列舉常常被人拿來當作狀態判斷的使用。enum 所佔的記憶體為32 位元(bit)，這是在預設的情況底下。

#87. Troubleshoot GCC 4.4.X version optimization switch-enum bug

At the end, attach a question aboutGCC's optimization of switch... reference. what is the size of an enum type data in C++? - https://stackoverflow.com/ ...

#88. Topic: gnu compiler question | Sysprogs

In my visualgdb project i use enums and i need it's size to be 4 bytes. Enum size is 1 byte on the assumption of current gcc settings.

#89. 如何通过gcc的配置选项确定默认枚举大小(短或非短)？ | 经验摘录

user@host:~$ echo '_Static_assert(4 == sizeof(enum{E}), "enum size is not 4");' | x86_64-linux-gnu-gcc -fsyntax-only -xc - && echo "OK, enum ...

#90. Can an enum be reduced to its bit size in C++? - DevDreamz

This isn't guaranteed, but makes it much more likely to happen. Using. enum BOOL : unsigned char { x , y};. makes A have a sizeof 1 in GCC, Clang and MSVC ...

#91. Comment spécifier enum taille de GCC? - AskCodez

Comment est-ce possible par le biais de GCC? ... garbage2 }; int main(void) { enum some_enum some_val; printf("size: %lu\n", sizeof(some_val)); return ...

#92. About size in 64 bit Bool,Uint,Enum - flat assembler

About size in 64 bit Bool,Uint,Enum. ... Your compiler can give you the sizes of most types via symbols as well, as in GCC:.

#93. Archivio Blog » Controlling the size of enums - CODER ...

The size of enums is compiler-dependent, and usually you don't have any control over ... Right now though, it doesn't seem to work with GCC.

#94. Question : How is the default enum size (short or no ... - CatWolf

I tried some gcc compilers to see if the default enum size is short (at least one byte, as forced with -fshort-enums ) or no-short (at least 4 bytes, ...

#95. The enum data type

enum Day { Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday }; ... Define an enum typed variable today = Wednesday; printf("sizeof(today) ...

#96. Enumerations - Developer Help

No type name is available to declare additional variables of the enum type later in code. . Using Enumeration Type Variable. If enumeration and variable have ...

#97. Enum reflection in C++ with template metaprogramming

Length . Both of these incur a runtime cost, but at least they exist. The most common workaround suggested for total number of enum elements in ...

#98. [Solved] What is the size of an enum in C? - Full Stack User

If I recall correctly, an enum is generally the same size as an int; but I thought I read somewhere that (at least in GCC) the compiler can make the enum ...

關於 gcc enum size ，我們在網路上蒐集到這些相關的討論、資訊與評價

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