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，...
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 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...
+ if (TREE_CODE (string) == VIEW_CONVERT_EXPR) + string = TREE_OPERAND (string, 0); + cexpr_str cstr (string); + if (!cstr.type_check (tok->location)) + return error_mark_node; + const char *msg; + int len; + if (!cstr.extract (tok->location, msg, len)) + return e...
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...
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++...
{ &&e - &&b < x; } | ^ code_2.c:1:13: error: use of GNU address-of-label extension [-Werror,-Wgnu-label-as-value] 1 | x() { &&e - &&b < x; } | ^ code_2.c:1:11: error: arithmetic on pointers to void is a GNU extension [-Werror,-Wgnu-pointer-arith] 1 | ...
The comparator is an object that might have state. So you should always use the comparator function instead of creating a default-constructed temporary C() like you did in insert(). If you don't see why, consider: template<typename K> struct AscOrDescComparator { bool descending{}; bool ...
expression must have a constant value cannot call non-constexpr function “__builtin_expect” (declared implicitly) Originally reported for the C/C++ extension for VS Code at https://github.com/Microsoft/vscode-cpptools/issues/2824Visual Studiowindows 10.0C++editorvisual studio ...
Nope, that's the case for const but constexpr is a different fish: "9.4.2/3 A static data member of literal type can be declared in the class definition with the constexpr specifier; if so, its declaration shall specify a brace-or-equal-initializer in which every initializer-clau...