Summary:

It'd be nice to have a builder pattern for var contexts to make them easy to construct for testing. Something that could be used like this:

MatrixXd m(3, 2); 
...
var_context vc
  = var_context::builder()
    .matrix("a", m)
    .real("f", 2.3)
    .build();

Current Version:

v2.23.0

Description

@JamesYang007 reports in their own repo readme) that there is an issue with math/stan/math/rev/functor/adj_jac_apply.hpp on line 513 and suggests adding a stan::math:: qualifier to the use of apply to avoid conflict with C++17.

Expected Output

Compilation in C++17 on GCC 10 without having to hand tweak the code.