本文整理汇总了C++中type_checker::is_prop方法的典型用法代码示例。如果您正苦于以下问题：C++ type_checker::is_prop方法的具体用法？C++ type_checker::is_prop怎么用？C++ type_checker::is_prop使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类type_checker的用法示例。
在下文中一共展示了type_checker::is_prop方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: is_ceqv
bool is_ceqv(type_checker & tc, expr e) {
if (has_expr_metavar(e))
return false;
name_set to_find;
// Define a procedure for removing arguments from to_find.
auto visitor_fn = [&](expr const & e, unsigned) {
if (is_local(e)) {
to_find.erase(mlocal_name(e));
return false;
} else if (is_metavar(e)) {
return false;
} else {
return true;
}
};
environment const & env = tc.env();
bool is_std = is_standard(env);
buffer<expr> hypotheses; // arguments that are propositions
while (is_pi(e)) {
if (!to_find.empty()) {
// Support for dependent types.
// We may find the instantiation for the previous arguments
// by matching the type.
for_each(binding_domain(e), visitor_fn);
}
expr local = mk_local(tc.mk_fresh_name(), binding_domain(e));
if (binding_info(e).is_inst_implicit()) {
// If the argument can be instantiated by type class resolution, then
// we don't need to find it in the lhs
} else if (is_std && tc.is_prop(binding_domain(e)).first) {
// If the argument is a proposition, we store it in hypotheses.
// We check whether the lhs occurs in hypotheses or not.
hypotheses.push_back(binding_domain(e));
} else {
to_find.insert(mlocal_name(local));
}
e = instantiate(binding_body(e), local);
}
expr lhs, rhs;
if (!is_simp_relation(env, e, lhs, rhs))
return false;
// traverse lhs, and remove found variables from to_find
for_each(lhs, visitor_fn);
if (!to_find.empty())
return false;
// basic looping ceq detection: the left-hand-side should not occur in the right-hand-side,
// nor it should occur in any of the hypothesis
if (occurs(lhs, rhs))
return false;
if (std::any_of(hypotheses.begin(), hypotheses.end(), [&](expr const & h) { return occurs(lhs, h); }))
return false;
return true;
}