WebThe macro can be used to specify alignment of types and data: struct BOOST_ALIGNMENT (16) my_data {char c [16];}; BOOST_ALIGNMENT (8) int arr [32]; BOOST_CONSTEXPR. Some compilers don't support the use of constexpr. This macro expands to nothing on those compilers, and constexpr elsewhere. For example, when defining a constexpr … WebFeb 21, 2024 · A constexpr function is one whose return value is computable at compile time when consuming code requires it. Consuming code requires the return value at compile …
c++ - Constexpr vs macros - Stack Overflow
WebSupport SFINAE use of constant expressions on compilers known to allow it. BOOST_ASIO_DISABLE_CONSTANT_EXPRESSION_SFINAE. BOOST_ASIO_HAS_CONSTEXPR. Support constexpr on compilers known to allow it. BOOST_ASIO_DISABLE_CONSTEXPR. BOOST_ASIO_HAS_CO_AWAIT. Support the … WebJun 28, 2024 · If we go ahead and replace the macro with a constant expression, we should get the warning at the exact location where the C-cast is written, not where the macros are expanded. While we are at it, we can replace the C-cast with the proper C++ cast, which in this case is reinterpret_cast: constexpr auto FOO = reinterpret_cast … downloadcertificateoptions
Replacing text macros - cppreference.com
WebMar 8, 2024 · In programming, a constant is a value that may not be changed. C++ supports several types of constants: const variables (which we’ll cover in this lesson and 4.14 -- Compile-time constants, constant expressions, and constexpr), and literals (which we’ll cover shortly, in lesson 4.15 -- Literals).. Const variables. So far, all of the variables … WebApr 22, 2024 · A macro is basically a "search-and-replace" that the preprocessor does. With your macro you have plain literal constants in your code. With declared variable you … WebJan 17, 2024 · constexpr is a feature added in C++ 11. The main idea is a performance improvement of programs by doing computations at compile time rather than run time. … clark job hiring