On Monday, 8 June 2015 at 19:57:34 UTC, Dmitry Olshansky wrote:
And they seem to almost have CTFE(!)
From wiki on C++14:
C++11 introduced the concept of a constexpr-declared function;
a function which could be executed at compile time. Their
return values could be consumed by operations that require
constant expressions, such as an integer template argument.
However, C++11 constexpr functions could only contain a single
expression that is returned (as well as static_asserts and a
small number of other declarations).
C++14 relaxes these restrictions. Constexpr-declared functions
may now contain the following:[5]
Any declarations except:
static or thread_local variables.
Variable declarations without initializers.
The conditional branching statements if and switch.
All looping statements, including range-based for.
Expressions which change the value of an object if the
lifetime of that object began within the constant expression
function. This includes calls to any non-const
constexpr-declared non-static member functions.
goto statements are forbidden in C++14 relaxed
constexpr-declared functions.
C++'s constexpr looks broken because everything must be marked
constexpre, which defeats the purpose of having compile-time code
looking like runtime code. But I never had the pleasure to use it.
