#include <chrono> #include <string> using namespace std::literals; int main() { ""s.size(); // ok (""s).size(); // ok (5ms).count(); // ok 5ms....

I'm trying to parse UUID expression using C++23, However compiling under clang 20.1.6 and gcc 15.1.0 find the operator as candidates yet it get ignored. here is my code: union uuid_t { unsigned ...

#include <array> template<std::size_t tc_n> requires (tc_n > 0) struct StringLiteral final { std::array<char, tc_n> value{}; consteval StringLiteral(char const (&sl)[...

I have two namespaces which both define the same User Defined Literals: namespace foo { struct x{ unsigned long long i; }; namespace literals { constexpr foo::x operator""_x(...

namespace ns { class MyClass { private: int value; MyClass(int val) : value(val) {} friend MyClass operator"" _myudl(unsigned long long int val); // Friend UDL declaration ...

I want to define a preprocessor macro with parameter N that constructs a declaration for C++ user-defined literal with suffix _uN. #define DEFINE_LITERAL(N) int operator""_u##N(const char* s)...

I frequently need to create string manipulation functions in C++. My APIs tend to be written to accept std::basic_string<T> (effectively), but I also want to accept std::basic_string_view<T&...

I am learning about user defined literals and I wrote the following program that works with gcc and msvc but clang rejects it. Live demo #include <array> template<std::size_t N> struct ...

Since the Standard Library never defines literal operators in the root std namespace, what is the danger of having user defined operators not starting with underscore?

I'm trying to define a user-defined string literal template. Shouldn't that code snippet work? / Why doesn't it work? template<char...> constexpr int operator ""_x () { return 0; } ...

Consider the following example provided by Aykhan Hagverdili: #include <string> using std::operator""s; #define s foobar auto s = "hello world"s; Some compilers would ...

I have a class with copy constructor and copy assign operator deleted. Move constructor amd move-assign operator are present. It also defines an operator<<: struct S { S(std::size_t s) {} ...

If I'm not mistaken, the arguments for a user defined literal are always known at compile time. In C++20 you can force functions to execute at compile time using consteval so that throw generates a ...

Literals don't seem to interplay well with preprocessor macros. For example, I have this preprocessor definition CONFIG_FADE_DELAY_MS that I want to translate to std::chrono::milliseconds. But the ms ...

At [over.literal] I read, in the list of examples, that double operator""_Bq(long double); is valid, whereas double operator"" _Bq(long double); is ill-formed, which is ...