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conio.h is a C header file used mostly by MS-DOS compilers to provide console input/output. [1] It is not part of the C standard library or ISO C, nor is it defined by POSIX. This header declares several useful library functions for performing "istream input and output" from a program.
The C headers <stdnoreturn.h> and <threads.h> do not have C++ equivalents and their C headers are not supported in C++. C++ does not provide the C POSIX library as part of any standard, however it is legal to use in a C++ program. If used in C++, the POSIX headers are not prepended with a "c" at the beginning of the name, and all contain the .h ...
Specifically, C allows a void* pointer to be assigned to any pointer type without a cast, while C++ does not; this idiom appears often in C code using malloc memory allocation, [9] or in the passing of context pointers to the POSIX pthreads API, and other frameworks involving callbacks. For example, the following is valid in C but not C++:
For #include guards to work properly, each guard must test and conditionally set a different preprocessor macro. Therefore, a project using #include guards must work out a coherent naming scheme for its include guards, and make sure its scheme doesn't conflict with that of any third-party headers it uses, or with the names of any globally visible macros.
Accessing my_union.i after most recently writing to the other member, my_union.d, is an allowed form of type-punning in C, [6] provided that the member read is not larger than the one whose value was set (otherwise the read has unspecified behavior [7]).
In the syntax of the C language, the second is unconditional, and hence always skips the call to SSLHashSHA1.final. As a consequence, err will hold the status of the SHA1 update operation, and signature verification will never fail. [5] Here, the unreachable code is the call to the final function. [6]
C++ does not define such a macro, but the type is always used for UTF-16 in that language. [16] char32_t [13] Part of the C standard since C11, [17] in <uchar.h>, a type capable of holding 32 bits even if wchar_t is another size. If the macro __STDC_UTF_32__ is defined as 1, the type is used for UTF-32 on that system.
The C preprocessor (used with C, C++ and in other contexts) defines an include directive as a line that starts #include and is followed by a file specification. COBOL defines an include directive indicated by copy in order to include a copybook. Generally, for C/C++ the include directive is used to include a header file, but can