Factory registry for creating concrete WilsonCoefficient objects by (coefficient, model, backend). More...

#include <functional>
#include <memory>
#include <unordered_map>
#include "GroupDefinition.h"
#include "Wilson.h"

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Classes
class	CoefficientRegistry
	Registry mapping (WCoef, Model, Backend) -> coefficient factory function. More...

Typedefs
using	CoefPtr = std::shared_ptr< WilsonCoefficient >
	Shared pointer type used to store coefficients in groups.

using	CoefMaker = std::function< CoefPtr(const BuildContext &, WCoef)>
	Factory signature for constructing a coefficient instance given a build context and enum id.

Functions
void	register_B (CoefficientRegistry &)
	Registers coefficient factories for the B group (C1..C10).

void	register_BPrime (CoefficientRegistry &)
	Registers coefficient factories for the B' group (CP1..CP10, CPQ1, CPQ2).

void	register_BScalar (CoefficientRegistry &)
	Registers coefficient factories for the scalar B group (CQ1, CQ2).

void	register_CC_bc (CoefficientRegistry &)
	Registers coefficient factories for charged-current b->c (C_V1_bc, ...).

void	register_CC_bu (CoefficientRegistry &)
	Registers coefficient factories for charged-current b->u (C_V1_bu, ...).

void	register_CC_cs (CoefficientRegistry &)
	Registers coefficient factories for charged-current c->s (C_V1_cs, ...).

void	register_CC_cd (CoefficientRegistry &)
	Registers coefficient factories for charged-current c->d (C_V1_cd, ...).

void	register_CC_su (CoefficientRegistry &)
	Registers coefficient factories for charged-current s->u (C_V1_su, ...).

void	register_CC_du (CoefficientRegistry &)
	Registers coefficient factories for charged-current d->u (C_V1_du, ...).

void	register_MesonMixing (CoefficientRegistry &)
	Registers coefficient factories for meson mixing coefficients.

void	register_K (CoefficientRegistry &reg)
	Registers coefficient factories for the K group (CK9, CK10, ...).

Detailed Description

Factory registry for creating concrete WilsonCoefficient objects by (coefficient, model, backend).

This header defines CoefficientRegistry, a lightweight runtime registry used to build the concrete WilsonCoefficient objects that populate a CoefficientGroup.

Motivation

In the domain layer, a same Wilson coefficient (e.g. C1) can have multiple concrete implementations depending on:

the active physics Model (SM / SUSY / THDM / ...),
the selected computation Backend (Builtin vs Marty).

Rather than hard-coding large switch statements in group builders, this registry provides:

explicit registration of "creator" functions (factories),
a single create() entry point with well-defined fallback rules.

Fallback rules implemented by @ref CoefficientRegistry::create

When create(ctx, c) is called: 1) Try exact match (c, ctx.model, ctx.backend). 2) For a non-SM model using the MARTY backend, route supported SM/BSM requests through the registered SM/MARTY factory while preserving the original build context. The factory then instantiates the target model. 3) Otherwise, if backend is Marty, fallback to Builtin for the same model. 4) If model is not SM, fallback to SM for the same backend.

If none match, an exception is thrown.

Typical usage

CoefficientRegistry reg;
register_B(reg);   // registers creators for the B group coefficients
 
BuildContext ctx{adapters, Model::SM, Backend::Builtin, ContributionType::SM, gid, "B"};
auto c1 = reg.create(ctx, WCoef::C1);