public static TEx <T> Let <T, L>(string alias, Func <TExArgCtx, TEx <L> > content, Func <TEx <T> > inner, TExArgCtx applier)
{
var variabl = V <L>();
using var let = applier.Let(alias, variabl);
return(Ex.Block(new[] { variabl },
Ex.Assign(variabl, content(applier)),
inner()
));
}
public static Ex Let2(Alias[] aliases, Func <Ex> inner, TExArgCtx applier)
{
var stmts = new Ex[aliases.Length + 1];
var vars = new ParameterExpression[aliases.Length];
var lets = new List <IDisposable>();
for (int ii = 0; ii < aliases.Length; ++ii)
{
Ex alias_value = aliases[ii].func(applier);
lets.Add(applier.Let(aliases[ii].alias, vars[ii] =
V(alias_value.Type, applier.Ctx.NameWithSuffix(aliases[ii].alias))));
stmts[ii] = Ex.Assign(vars[ii], alias_value);
}
stmts[aliases.Length] = inner();
for (int ii = 0; ii < lets.Count; ++ii)
{
lets[ii].Dispose();
}
return(Ex.Block(vars, stmts));
}
