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MayankMayank
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How to get the type of T from a member of a generic class or method?
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I actually just used typeof(Type) and it works great.
– Anton
Jun 26 '17 at 14:39
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Pretty-print C++ STL containers
... // Don't insert a delimiter if this is the first time the function is called
if( _insertDelim )
(*_stream) << _delim;
else
_insertDelim = true;
}
(*_stream) << value;
return *this;
}
pretty_ostre...
How to initialize a vector in C++ [duplicate]
...p;arr[0]+N; }
And then you can do this without having to repeat the size all over:
int vv[] = { 12,43 };
std::vector<int> v(begin(vv), end(vv));
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How to define “type disjunction” (union types)?
...str")
case _: Int => println("int")
}
}
And that's it. You can call foo(5) or foo("abc"), and it will work, but try foo(true) and it will fail. This could be side-stepped by the client code by creating a StringOrInt[Boolean], unless, as noted by Randall below, you make StringOrInt a seale...
Interpret XMP-Metadata in ALAssetRepresentation
...epresentation];
// Create a buffer to hold the data for the asset's image
uint8_t *buffer = (Byte*)malloc(representation.size); // Copy the data from the asset into the buffer
NSUInteger length = [representation getBytes:buffer fromOffset: 0.0 length:representation.size error:nil];
if (length==0)...
获取控件的值的几种方法总结 - C/C++ - 清泛网 - 专注C/C++及内核技术
...t nIDC, int& value );
void AFXAPI DDX_Text( CDataExchange* pDX, int nIDC, UINT& value );
void AFXAPI DDX_Text( CDataExchange* pDX, int nIDC, long& value );
void AFXAPI DDX_Text( CDataExchange* pDX, int nIDC, DWORD& value );
void AFXAPI DDX_Text( CDataExchange* pDX, int nIDC, CString& value );
v...
CDC:DrawText 多行显示文本（文本自动换行） - C/C++ - 清泛网 - 专注C/C++及内核技术
... // text length
LPRECT lpRect, // formatting dimensions
UINT uFormat // text-drawing options
);
参数：
hdc：设备环境句柄。
lpString：指向将被写入的字符串的指针，如果参数nCount是C1，则字符串必须是以\0结束的。
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ON_COMMAND_EX、ON_COMMAND区别 - C/C++ - 清泛网 - 专注C/C++及内核技术
...应的普通映射宏相比，有两个不同之处：
一是多了一个UINT类型的参数，另外就是有返回值（返回BOOL类型）。
回顾4.4.2章节，范围映射宏ON_COMMAND_RANGE的消息处理函数也有一个这样的参数，该参数在两处的含义是一样的，
即：
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MFC 菜单背景色设置（菜单重绘） - C/C++ - 清泛网 - 专注C/C++及内核技术
...E_MAP()
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int CMainFrm::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
UINT style=0;
if (CFrameWnd::OnCreate(lpCreateStruct) == -1)
return -1;
mMenu.AttatchMenu(LoadMenu(NULL,MAKEINTRESOURCE(IDR_MAINFRAME)));
mMenu.ChangeMenuItem(&mMenu,TRUE);
SetMenu(&mMenu);
...
}
void C...