[#bsl-basic_string-0e-replace-05]
= xref:bsl.adoc[bsl]::xref:bsl/basic_string-0e.adoc[basic_string<wchar_t>]::replace
:relfileprefix: ../../
:mrdocs:

Replace the specified `outNumChars` characters starting at the specified `outPosition` in this string (or the suffix of this string starting at `outPosition` if `outPosition + outNumChars > length()`) with the optionally specified `numChars` characters starting at the specified `position` in the specified `replacement` string (or the suffix of `replacement` starting at `position` if `position + numChars > replacement.length()`). If `numChars` is not specified, `npos` is used. Return a reference providing modifiable access to this string. Throw `out_of_range` if `outPosition > length()` or `position > replacement.length()`.

== Synopsis

Declared in `<bslstl_string.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:bsl/basic_string-0faf.adoc[basic_string<wchar_t>]&
replace(
    xref:bsl/basic_string-0e/size_type.adoc[size_type] outPosition,
    xref:bsl/basic_string-0e/size_type.adoc[size_type] outNumChars,
    xref:bsl/basic_string-0faf.adoc[basic_string<wchar_t>] const& replacement,
    xref:bsl/basic_string-0e/size_type.adoc[size_type] position,
    xref:bsl/basic_string-0e/size_type.adoc[size_type] numChars = npos);
----


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