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c++ Programming Glossary: unionDetecting endianness programmatically in a C++ program http://stackoverflow.com/questions/1001307/detecting-endianness-programmatically-in-a-c-program often be warned against by compiler. That's exactly what unions are for int is_big_endian void union uint32_t i char c 4 bint.. That's exactly what unions are for int is_big_endian void union uint32_t i char c 4 bint 0x01020304 return bint.c 0 1 The principle..
C and C++ : Partial initialization of automatic structure http://stackoverflow.com/questions/10828294/c-and-c-partial-initialization-of-automatic-structure if T has no accessible default constructor if T is a non union class type without a user declared constructor then every non..
C Macro definition to determine big endian or little endian machine? http://stackoverflow.com/questions/2100331/c-macro-definition-to-determine-big-endian-or-little-endian-machine 0x00010203ul O32_PDP_ENDIAN 0x01000302ul static const union unsigned char bytes 4 uint32_t value o32_host_order 0 1 2 3..
How can I add reflection to a C++ application? http://stackoverflow.com/questions/41453/how-can-i-add-reflection-to-a-c-application . Inspection by checking whether a class type class struct union has a method or nested type is derived from another particular..
http://stackoverflow.com/questions/4172722/what-is-the-rule-of-three members The implicitly defined copy constructor for a non union class X performs a memberwise copy of its subobjects. n3126.pdf.. The implicitly defined copy assignment operator for a non union class X performs memberwise copy assignment of its subobjects...
What are Aggregates and PODs and how/why are they special? http://stackoverflow.com/questions/4178175/what-are-aggregates-and-pods-and-how-why-are-they-special aggregate if&hellip wait nothing is said about structs or unions can't they be aggregates Yes they can. In C the term class.. can. In C the term class refers to all classes structs and unions. So a class or struct or union is an aggregate if and only.. to all classes structs and unions. So a class or struct or union is an aggregate if and only if it satisfies the criteria from..
http://stackoverflow.com/questions/4421706/operator-overloading For the operator value_type must be of class or struct or union type otherwise their implementation results in a compile time..
When do I use a dot, arrow, or double colon to refer to members of a class in C++? http://stackoverflow.com/questions/4984600/when-do-i-use-a-dot-arrow-or-double-colon-to-refer-to-members-of-a-class-in-c The small print In C types declared as class struct or union are considered of class type . So the above refers to all three..
Is there a way to instantiate objects from a string holding their class name? http://stackoverflow.com/questions/582331/is-there-a-way-to-instantiate-objects-from-a-string-holding-their-class-name string variant_type map_type A boost variant is like an union. It knows which type is stored in it by looking what object..
Where and why do I have to put the “template” and “typename” keywords? http://stackoverflow.com/questions/610245/where-and-why-do-i-have-to-put-the-template-and-typename-keywords not a function Background I implemented a discriminated union capable of holding C types even if they have destructors etc... . For instance I've got a member template typename U union_cast U that should only be instantiated for types that could.. be instantiated for types that could actually be in the union. Trying to cast a Union bool float to std string is a compile..
Difference between 'struct' and 'typedef struct' in C++? http://stackoverflow.com/questions/612328/difference-between-struct-and-typedef-struct-in-c two different namespaces of types a namespace of struct union enum tag names and a namespace of typedef names. If you just.. to give it a name in the tag namespace. In C all struct union enum class declarations act like they are implicitly typedef..
What are the differences between struct and class in C++ http://stackoverflow.com/questions/92859/what-are-the-differences-between-struct-and-class-in-c
Why compiler doesn't allow std::string inside union? http://stackoverflow.com/questions/3521914/why-compiler-doesnt-allow-stdstring-inside-union allow std string inside union i want to use string inside Union. if i write as below union U int i float f string s Compiler.. just provides some comfort to access valid values from Union. Your question how do you or the compiler write a copy constructor.. location. Let the string be of any length. All that Union has to know is invoking string class copy constructor with string..
Union in c++ are they feasible http://stackoverflow.com/questions/5275100/union-in-c-are-they-feasible in c are they feasible Can a union in C have a member function..
What are access specifiers? Should I inherit with private, protected or public? http://stackoverflow.com/questions/5447498/what-are-access-specifiers-should-i-inherit-with-private-protected-or-public There are 3 access specifiers for a class struct Union in C . These access specifiers define how the members of the..
Where and why do I have to put the “template” and “typename” keywords? http://stackoverflow.com/questions/610245/where-and-why-do-i-have-to-put-the-template-and-typename-keywords code template typename T typename Tail Tail will be a UnionNode too. struct UnionNode public Tail ... template typename.. T typename Tail Tail will be a UnionNode too. struct UnionNode public Tail ... template typename U struct inUnion Q where.. UnionNode public Tail ... template typename U struct inUnion Q where to add typename template here typedef Tail inUnion U..
Union hack for endian testing and byte swapping http://stackoverflow.com/questions/6359629/union-hack-for-endian-testing-and-byte-swapping hack for endian testing and byte swapping For a union writing..
Union ??useless anachronism or useful old school trick? http://stackoverflow.com/questions/858035/union-useless-anachronism-or-useful-old-school-trick useless anachronism or useful old school trick I recently came.. up with contrived situations or hacks where I would use a Union. But I am not interested in contrived situations or hacks..... Have you used or seen an implementation where using Union solved the problem more elegantly than not using a Union Added..
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