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The memory area storing the value has no intrinsic type (other than just bytes or words of memory), but the value can be treated as one of several abstract data types, having the type of the value that was last written to the memory area. In type theory, a union has a sum type; this corresponds to disjoint union in mathematics.
One advanced dialect of C, called Cyclone, has extensive built-in support for tagged unions. [1] The enum types in the Rust, Haxe, and Swift languages also work as tagged unions. The variant library from the Boost C++ Libraries demonstrated it was possible to implement a safe tagged union as a library in C++, visitable using function objects.
Return pointer on stack if not member function. Also supported by GCC. register: Delphi, Free Pascal, Linux [30] EAX, EDX, ECX: LTR (Pascal) Callee thiscall: Windows (Microsoft Visual C++) ECX: RTL (C) Callee Default for member functions. vectorcall: Windows (Microsoft Visual C++) ECX, EDX, [XY]MM0–5 RTL (C) Callee Extended from fastcall.
It evaluates to the offset (in bytes) of a given member within a struct or union type, an expression of type size_t. The offsetof() macro takes two parameters, the first being a structure or union name, and the second being the name of a subobject of the structure/union that is not a bit field. It cannot be described as a C prototype. [1]
XAudio2 operates through the XAudio API on the Xbox 360, through DirectSound on Windows XP, and through the low-level audio mixer WASAPI on Windows Vista and higher. The RTM release of the XAudio2 library is included in the March 2008 DirectX SDK , [ 6 ] enabling a programmer with Visual Studio to use XAudio2 in a Windows, Xbox 360 and Windows ...
Here, attempting to use a non-class type in a qualified name (T::foo) results in a deduction failure for f<int> because int has no nested type named foo, but the program is well-formed because a valid function remains in the set of candidate functions.
A C++03 compiler has no way of knowing if get_five() actually is constant at runtime. In theory, this function could affect a global variable, call other non-runtime constant functions, etc. C++11 introduced the keyword constexpr, which allows the user to guarantee that a function or object constructor is a compile-time constant. [11]
The Combined Community Codec Pack, more commonly referred to by its acronym CCCP, is a collection of codecs (video compression filters) packed for Microsoft Windows, designed originally for the playback of anime fansubs. [2] The CCCP was developed and maintained by members of various fansubbing groups.