class Account { public: static double rate() { return test1; } // 错误:非整型静态数据成员不能在类内直接初始化 // static double test1 = 3.14; static double test1; }; // 正确的初始化方式:在类外初始化 double Account::test1 = 3.14; 如果确实需要在类内初始化静态数据成员,并且该成员是非整...
In C++11, non-staticdata members,static constexprdata members, andstatic constdata members of integral or enumeration type may be initialized in the class declaration. e.g. struct X { int i=5; const float f=3.12f; static const int j=42; static constexpr float g=9.5f; };...
In file included from /bla/hardware/Arduino_STM32/STM32F1/libraries/STM32ADC/examples/SingleConversionInterrupt/SingleConversionInterrupt.ino:1:0: /bla/hardware/Arduino_STM32/STM32F1/libraries/STM32ADC/src/STM32ADC.h:155:40: error: 'constexpr' needed for in-class initialization of static data...
and the main rules should make it obvious what's an exceptional case (e.g. by omitting the specific keywords that would be needed for exceptional cases)
The class does not have anyvirtual base class. For aconstexprconstructor that is neither defaulted nor templated, if no argument values exist such that an invocation of the function could be an evaluated subexpression of the initialization full-expression of some object subject toconstant expression...
This was the last feature that we needed to implement for C++11 constexpr support and we’re excited to ship it with Update 1. We should extend kudos to Tanveer Gani for the herculean work he’s done to make this feature ship with Update 1. Because of his work, Update 1 will be ...
but an empty class instead. So it doesn’t contains an indeterminate value even when default-initialized. On the other hand, libc++ & MSVC STL’sstd::array<T, 0>do store a built-in array ofchar, so default-initialization is no suitable forcon...
In /O2 if I change the Width declaration tostatic constexpr auto Width = 16u;aka spefiying unsigned I don’t get garbage anymore. Also I also found that that code should not compile. This initialization,auto frameRowPrev = FrameRowView<PixelRGBui8> { Width };, should not allo...
In the beginning, we experienced an issue with the early initialization of static variables in the init priority. This involved utilizing various pieces of code, such asstruct Type<int> { static int max; };for a specific purpose, globalstatic int x = Type<int>::max;, and other early cod...
For pybind11, we can use the py::return_value_policy::copy as described here .def_readonly_static("NAN", &Class::NaN, py::return_value_policy::copy, "math::Vector2(NaN, NaN)") If that seems reasonable, I can push my changes to this PR. 👍 1 Contributor Author jwnimmer-tri...