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bstr-t-operator-add-equal-plus.md

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50 lines (33 loc) · 1.46 KB
title _bstr_t::operator +=, +
ms.date 11/04/2016
f1_keywords
_bstr_t::operator+
_bstr_t::operator+=
helpviewer_keywords
+= operator [C++], appending strings
+ operator [C++], _bstr_t objects
ms.assetid d28316ce-c2c8-4a38-bdb3-44fa4e582c44

_bstr_t::operator +=, +

Microsoft Specific

Appends characters to the end of the _bstr_t object or concatenates two strings.

Syntax

_bstr_t& operator+=( const _bstr_t& s1 );
_bstr_t operator+( const _bstr_t& s1 );
friend _bstr_t operator+( const char* s2, const _bstr_t& s1);
friend _bstr_t operator+( const wchar_t* s3, const _bstr_t& s1);

Parameters

s1
A _bstr_t object.

s2
A multibyte string.

s3
A Unicode string.

Remarks

These operators perform string concatenation:

  • operator+=( s1 ) Appends the characters in the encapsulated BSTR of s1 to the end of this object's encapsulated BSTR.

  • operator+( s1 ) Returns the new _bstr_t that is formed by concatenating this object's BSTR with that of s1.

  • operator+( s2 | s1 ) Returns a new _bstr_t that is formed by concatenating a multibyte string s2, converted to Unicode, with the BSTR encapsulated in s1.

  • operator+( s3 , s1 ) Returns a new _bstr_t that is formed by concatenating a Unicode string s3 with the BSTR encapsulated in s1.

END Microsoft Specific

See also

_bstr_t Class