6.4.1/2 [如果成立则终止]如果if语句的格式为if constexpr [...]如果转换后的条件的值为false，...
I develop my own string class that has both small string optimization and has an internal flag to know if the string is Ascii, UTF8, WTF8 or a byte string. The constructor String(constchar* ); can be used to construct either an Ascii string or an UTF8 string. It should only be use...
class X { public: static constexpr bool constexprFoo() { return true; } template<class T> T foo() { if constexpr (constexprFoo()) {} return {}; } } 1>TestConstexpr.cpp 1>C:\home\c\TestConstexpr\TestConstexpr.cpp(12,35): error C2131: expression did not evaluate to ...
If aconstexprvariable is nottranslation-unit-local, it should not be initialized to refer to a translation-unit-local entity that is usable in constant expressions, nor have a subobject that refers to such an entity. Such initialization is disallowed in amodule interface unit(outside its privat...
The result is: 7 7 7 So far so good. Is there a way (possibly standard) to know inside foo(const int s) if the function is executed at compile time or at runtime? EDIT: Also is it possible to know at runtime if a function was evaluated at compile time? c++ c+...
If the asm-specification is present, returns a STRING_CST corresponding to the string-literal. Otherwise, returns @@ -29650,9 +29696,7 @@ cp_parser_asm_specification_opt (cp_parser* parser) parens.require_open (parser); /* Look for the string-literal. */ ...
But if you change the size of the array arrayA to something small like 1 in /O2 it will output the right value. Clang in -O0 and -O2 will output 16. trying to use ASAN ( clang and MSVC), there is an error of stack-use-after-scope, which would explain the issue, b...
the compound statement of the constructor body must satisfy the constraints for the body of a constexpr function for the constructor of a class or struct, every base class sub-object and every non-variant non-static data member must be initialized. If the class is a union-like class, for ...
If there is no special problem, I would like to use constexpr and all other new features I understood. So I just tested this feature by the above example. If I could not use it here, I would like to know why, because I learned something wrong. If it is just a problem of VC++...
Originally reported for the C/C++ extension for VS Code athttps://github.com/Microsoft/vscode-cpptools/issues/2824 Visual Studiowindows 10.0C++editorvisual studio 2017 version 15.9 This issue is read only, because it has been in the Closed - Fixed state for over 90 day...