[#BloombergLP-bdlb-String-trim-0e]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlb.adoc[bdlb]::xref:BloombergLP/bdlb/String.adoc[String]::trim
:relfileprefix: ../../../
:mrdocs:

Remove all leading and trailing whitespace characters from the specified `string` having the specified `length`, and load into `length` the number of characters in the resulting (trimmed) string. If `string` consists of only whitespace then it will be empty (i.e., have 0 length) after this operation. The behavior is undefined unless `0 <= *length`. Note that `length` is both an input and output parameter. See `bdlb_stringviewutil` for an identically named method having similar semantics taking (and returning) `bsl::string_view`.

== Synopsis

Declared in `<bdlb_string.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
static
void
trim(
    char* string,
    int* length);
----


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