union VariantData_u
{
    uint32_t                                ui32;
    int32_t                                 i32;
    float                                   f32;

    explicit VariantData_u( int8_t i ) :    i32(i)    {    }
    explicit VariantData_u( int16_t i ) :   i32(i)    {    }
    explicit VariantData_u( int32_t i ) :   i32(i)    {    }
    explicit VariantData_u( uint8_t u ) :   ui32(u)   {    }
    explicit VariantData_u( uint16_t u ) :  ui32(u)   {    }
    explicit VariantData_u( uint32_t u ) :  ui32(u)   {    }
    explicit VariantData_u( float f ) :     f32(f)    {    }
};

goDoDomething( VariantData_u( 0.0f ) );