:relfileprefix: ../../../../
[#C50486B42C84C8E6C81A5D4356B9291CDF0F3A8F]

= Function arg::prepare

pass:v,q[Return a modifiable character buffer]


== Synopsis

Declared in header `</boost/url/grammar/string_token.hpp#L68[boost/url/grammar/string_token.hpp,window=blank_]>`

[source,cpp,subs="verbatim,macros,-callouts"]
----
virtual
char*
prepare(size_t n) = 0;
----

== Description

pass:v,q[This function attempts to obtain a] pass:v,q[character buffer with space for at]
pass:v,q[least `n` characters. Upon success,]
pass:v,q[a pointer to the beginning of the]
pass:v,q[buffer is returned. Ownership is not]
pass:v,q[transferred; the caller should not]
pass:v,q[attempt to free the storage. The]
pass:v,q[buffer shall remain valid until]
pass:v,q[`this` is destroyed.]
[NOTE]
pass:v,q[This function may only be called once.]
pass:v,q[After invoking the function, the only]
pass:v,q[valid operation is destruction.]



== Return Value

* `` 


== Parameters

|===
| Name | Type 

| *n*
| `size_t`

|===