environment environment::add(certified_declaration const & d) const {
if (!m_id.is_descendant(d.get_id()))
throw_incompatible_environment(*this);
name const & n = d.get_declaration().get_name();
if (find(n))
throw_already_declared(*this, n);
return environment(m_header, m_id, insert(m_declarations, n, d.get_declaration()), m_global_levels, m_extensions);
}
environment environment::replace(certified_declaration const & t) const {
if (!m_id.is_descendant(t.get_id()))
throw_incompatible_environment(*this);
name const & n = t.get_declaration().get_name();
auto ax = find(n);
if (!ax)
throw_kernel_exception(*this, "invalid replacement of axiom with theorem, the environment does not have an axiom with the given name");
if (!ax->is_axiom())
throw_kernel_exception(*this, "invalid replacement of axiom with theorem, the current declaration in the environment is not an axiom");
if (!t.get_declaration().is_theorem())
throw_kernel_exception(*this, "invalid replacement of axiom with theorem, the new declaration is not a theorem");
if (ax->get_type() != t.get_declaration().get_type())
throw_kernel_exception(*this, "invalid replacement of axiom with theorem, the 'replace' operation can only be used when the axiom and theorem have the same type");
return environment(m_header, m_id, insert(m_declarations, n, t.get_declaration()), m_global_levels, m_extensions);
}