[R-sig-ME] Likelihood

[Bonitta Gianluca]

Hello my names is Bonitta Gianluca a statistics student from Italy. 
Im starting C++ programming. I would ask if someone have modified lme4 R pack 
source code for returning likelihood or (loglike) function for linear mixed 
model. If yes, can show me this please. I will use this likelihood for build 
up posterior density for MCMC simulation. I need to calculate likelihood not 
only into maximum estimate paramer value, but i need calculation of likelihood 
for all value that MCMC sampling need. Thanks in advance, sorry for noise.
Best
Bonitta