Convert code to constexpr

Question

What are the general tips for converting code to constexpr? Let's say there is an algorithm for some geometrical transmorcation (input) of a geometric figure. Entrance and exit differ in nature and size and depend on each other non-trivially. Currently, it is implemented as a class in which it is currently used std::mapand std::vector(without loss of generality).

What is a refactoring method that uses dynamic memory to get code that meets the requirements for constant expressions?

I can imagine some combination of constexprcontainer packages and a constexprcompatible stack distributor implementation (for large enough storage) for each container used value_type. But there is a problem: I have never met such containers. But maybe there are other ways?

Answer 1

(std::bitset, std::array ..) constexpr constexpr. , . . Q & A.

, , , ( 5.20 [expr.const] )

• ( std::inplace_merge .)
• ( <iostream>)
• - ( N4487)
• reinterpret_cast
• goto (, N4472)

• , new/delete constexpr.
• ( constexpr) a switch.
• lambdas a constexpr operator().
• reinterpret_cast constexpr ( union ).
• goto , .

new/delete . / .

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