[#Lookup-0b]
= Lookup
:mrdocs:

Resolve a service string to its first corresponding service.

== Synopsis

Declared in `<netbase.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
std::optional<CService>
Lookup(
    std::string const& name,
    uint16_t portDefault,
    bool fAllowLookup,
    xref:DNSLookupFn.adoc[DNSLookupFn] dns_lookup_function = g_dns_lookup);
----

== Return Value

The first resolved service, or std::nullopt if the string does not resolve.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *name*
| The service string to resolve.
| *portDefault*
| The port to use when the service string omits one.
| *fAllowLookup*
| Whether DNS lookups are permitted.
| *dns_lookup_function*
| The resolver used to perform the lookup.
|===

== See Also

Lookup(const std::string&, uint16_t, bool, unsigned int, DNSLookupFn) for additional parameter descriptions.


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