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‎docs/c-runtime-library/reference/strncmp-wcsncmp-mbsncmp-mbsncmp-l.md‎

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**wcsncmp** and **_mbsncmp** are wide-character and multibyte-character versions of **strncmp**. The arguments of **wcsncmp** are wide-character strings; those of **_mbsncmp** are multibyte-character strings. **_mbsncmp** recognizes multibyte-character sequences according to a multibyte code page and returns **_NLSCMPERROR** on an error.
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Also, **_mbsncmp** and **_mbsncmp_l** validate parameters. If *string1* or *string2* is a null pointer, the invalid parameter handler is invoked, as described in [Parameter Validation](../../c-runtime-library/parameter-validation.md). If execution is allowed to continue, **_mbsncmp** and **_mbsncmp_l** return **_NLSCMPERROR** and set **errno** to **EINVAL**. **strncmp** and **wcsncmp** do not validate their parameters. These functions behave identically otherwise.
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Also, **_mbsncmp** and **_mbsncmp_l** validate parameters. If *string1* or *string2* is a null pointer and *count* is not equal to 0, the invalid parameter handler is invoked, as described in [Parameter Validation](../../c-runtime-library/parameter-validation.md). If execution is allowed to continue, **_mbsncmp** and **_mbsncmp_l** return **_NLSCMPERROR** and set **errno** to **EINVAL**. **strncmp** and **wcsncmp** do not validate their parameters. These functions behave identically otherwise.
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The comparison behavior of **_mbsncmp** and **_mbsncmp_l** is affected by the setting of the **LC_CTYPE** category setting of the locale. This controls detection of leading and trailing bytes of multibyte characters. For more information, see [setlocale](setlocale-wsetlocale.md). The **_mbsncmp** function uses the current locale for this locale-dependent behavior. The **_mbsncmp_l** function is identical except that it uses the *locale* parameter instead. For more information, see [Locale](../../c-runtime-library/locale.md). If the locale is a single-byte locale, the behavior of these functions is identical to **strncmp**.
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‎docs/cpp/variant-t-operator-equal.md‎

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---
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description: "Learn more about: _variant_t::operator ="
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title: "_variant_t::operator ="
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ms.date: "11/04/2016"
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description: "Learn more about: _variant_t::operator="
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title: "_variant_t::operator="
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ms.date: 03/23/2021
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f1_keywords: ["_variant_t::operator="]
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helpviewer_keywords: ["operator= [C++], variant", "operator = [C++], variant", "= operator [C++], with specific Visual C++ objects"]
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ms.assetid: 77622723-6e49-4dec-9e0f-fa74028f1a3c
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---
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# _variant_t::operator =
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# `_variant_t::operator=`
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**Microsoft Specific**
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Assigns a new value to a `_variant_t` instance.
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The `_variant_t` class and its `operator=` member are **Microsoft-specific**.
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## Syntax
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```cpp
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_variant_t& operator=( const VARIANT& varSrc );
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_variant_t& operator=( const VARIANT* pVarSrc );
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_variant_t& operator=( const _variant_t& var_t_Src );
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_variant_t& operator=( short sSrc );
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_variant_t& operator=( long lSrc );
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_variant_t& operator=( float fltSrc );
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_variant_t& operator=( double dblSrc );
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_variant_t& operator=( const CY& cySrc );
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_variant_t& operator=( const _bstr_t& bstrSrc );
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_variant_t& operator=( const wchar_t* wstrSrc );
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_variant_t& operator=( const char* strSrc );
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_variant_t& operator=( IDispatch* pDispSrc );
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_variant_t& operator=( bool bSrc );
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_variant_t& operator=( IUnknown* pSrc );
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_variant_t& operator=( const DECIMAL& decSrc );
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_variant_t& operator=( BYTE byteSrc );
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_variant_t& operator=( char cSrc );
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_variant_t& operator=( unsigned short usSrc );
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_variant_t& operator=( unsigned long ulSrc );
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_variant_t& operator=( int iSrc );
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_variant_t& operator=( unsigned int uiSrc );
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_variant_t& operator=( __int64 i8Src );
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_variant_t& operator=( unsigned __int64 ui8Src );
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```
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_variant_t& operator=(
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const VARIANT& varSrc
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);
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_variant_t& operator=(
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const VARIANT* pVarSrc
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);
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_variant_t& operator=(
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const _variant_t& var_t_Src
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);
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_variant_t& operator=(
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short sSrc
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);
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_variant_t& operator=(
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long lSrc
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);
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_variant_t& operator=(
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float fltSrc
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);
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### Parameters
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_variant_t& operator=(
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double dblSrc
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);
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*`varSrc`*\
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A reference to a `VARIANT` from which to copy the content and `VT_*` type.
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_variant_t& operator=(
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const CY& cySrc
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);
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*`pVarSrc`*\
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A pointer to a `VARIANT` from which to copy the content and `VT_*` type.
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_variant_t& operator=(
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const _bstr_t& bstrSrc
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);
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*`var_t_Src`*\
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A reference to a `_variant_t` from which to copy the content and `VT_*` type.
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_variant_t& operator=(
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const wchar_t* wstrSrc
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);
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*`sSrc`*\
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A **`short`** integer value to copy. Given type `VT_BOOL` if `*this` is of type `VT_BOOL`. Otherwise, it's given type `VT_I2`.
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_variant_t& operator=(
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const char* strSrc
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);
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*`lSrc`*\
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A **`long`** integer value to copy. Given type `VT_BOOL` if `*this` is of type `VT_BOOL`. Given type `VT_ERROR` if `*this` is of type `VT_ERROR`. Otherwise, given type `VT_I4`.
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_variant_t& operator=(
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IDispatch* pDispSrc
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);
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*`fltSrc`*\
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A **`float`** numerical value to copy. Given type `VT_R4`.
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_variant_t& operator=(
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bool bSrc
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);
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*`dblSrc`*\
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A **`double`** numerical value to copy. Given type `VT_DATE` if `this` is of type `VT_DATE`. Otherwise, given type `VT_R8`.
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_variant_t& operator=(
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IUnknown* pSrc
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);
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*`cySrc`*\
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A `CY` object to copy. Given type `VT_CY`.
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_variant_t& operator=(
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const DECIMAL& decSrc
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);
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*`bstrSrc`*\
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A `BSTR` object to copy. Given type `VT_BSTR`.
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_variant_t& operator=(
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BYTE bSrc
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);
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*`wstrSrc`*\
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A Unicode string to copy, stored as a `BSTR` and given type `VT_BSTR`.
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_variant_t& operator=(
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char cSrc
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);
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*`strSrc`*\
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A multibyte string to copy, stored as a `BSTR` and given type `VT_BSTR`.
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_variant_t& operator=(
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unsigned short usSrc
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);
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*`pDispSrc`*\
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An `IDispatch` pointer to copy with a call to `AddRef`. Given type `VT_DISPATCH`.
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_variant_t& operator=(
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unsigned long ulSrc
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);
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*`bSrc`*\
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A **`bool`** value to copy. Given type `VT_BOOL`.
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_variant_t& operator=(
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int iSrc
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);
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*`pSrc`*\
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An `IUnknown` pointer to copy with a call to `AddRef`. Given type `VT_UNKNOWN`.
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_variant_t& operator=(
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unsigned int uiSrc
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);
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*`decSrc`*\
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A `DECIMAL` object to copy. Given type `VT_DECIMAL`.
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_variant_t& operator=(
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__int64 i8Src
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);
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_variant_t& operator=(
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unsigned __int64 ui8Src
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);
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```
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## Remarks
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*`byteSrc`*\
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A `BYTE` value to copy. Given type `VT_UI1`.
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The operator assigns a new value to the `_variant_t` object:
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*`cSrc`*\
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A **`char`** value to copy. Given type `VT_I1`.
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- **operator=(** *varSrc* **)** Assigns an existing `VARIANT` to a `_variant_t` object.
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*`usSrc`*\
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An **`unsigned short`** value to copy. Given type `VT_UI2`.
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- **operator=(** *pVarSrc* **)** Assigns an existing `VARIANT` to a `_variant_t` object.
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*`ulSrc`*\
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An **`unsigned long`** value to copy. Given type `VT_UI4`.
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- **operator=(** *var_t_Src* **)** Assigns an existing `_variant_t` object to a `_variant_t` object.
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*`iSrc`*\
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An **`int`** value to copy. Given type `VT_INT`.
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- **operator=(** *sSrc* **)** Assigns a **`short`** integer value to a `_variant_t` object.
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*`uiSrc`*\
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An **`unsigned int`** value to copy. Given type `VT_UINT`.
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- **operator=(** `lSrc` **)** Assigns a **`long`** integer value to a `_variant_t` object.
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*`i8Src`*\
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An **`__int64`** or **`long long`** value to copy. Given type `VT_I8`.
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- **operator=(** *fltSrc* **)** Assigns a **`float`** numerical value to a `_variant_t` object.
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*`ui8Src`*\
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An **`unsigned __int64`** or **`unsigned long long`** value to copy. Given type `VT_UI8`.
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- **operator=(** *dblSrc* **)** Assigns a **`double`** numerical value to a `_variant_t` object.
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- **operator=(** *cySrc* **)** Assigns a `CY` object to a `_variant_t` object.
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- **operator=(** *bstrSrc* **)** Assigns a `BSTR` object to a `_variant_t` object.
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- **operator=(** *wstrSrc* **)** Assigns a Unicode string to a `_variant_t` object.
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- **operator=(** `strSrc` **)** Assigns a multibyte string to a `_variant_t` object.
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- **operator=(** `bSrc` **)** Assigns a **`bool`** value to a `_variant_t` object.
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- **operator=(** *pDispSrc* **)** Assigns an `IDispatch*` object to a `_variant_t` object and calls `AddRef`.
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- **operator=(** *pIUnknownSrc* **)** Assigns an `IUnknown*` object to a `_variant_t` object and calls `AddRef`.
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## Remarks
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- **operator=(** *decSrc* **)** Assigns a `DECIMAL` value to a `_variant_t` object.
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The `operator=` assignment operator clears any existing value, which deletes object types, or calls `Release` for `IDispatch*` and `IUnknown*` types. Then, it copies a new value into the `_variant_t` object. It changes the `_variant_t` type to match the assigned value, except as noted for **`short`**, **`long`**, and **`double`** arguments. Value types are copied directly. A `VARIANT` or `_variant_t` pointer or reference argument copies the assigned object's contents and type. Other pointer or reference type arguments create a copy of the assigned object. The assignment operator calls `AddRef` for `IDispatch*` and `IUnknown*` arguments.
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- **operator=(** `bSrc` **)** Assigns a `BYTE` value to a `_variant_t` object.
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`operator=` invokes [`_com_raise_error`](../cpp/com-raise-error.md) if an error occurs.
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**END Microsoft Specific**
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`operator=` returns a reference to the updated `_variant_t` object.
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## See also
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[_variant_t Class](../cpp/variant-t-class.md)
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[`_variant_t` class](../cpp/variant-t-class.md)

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