C++0x, How do I expand a tuple into variadic template function arguments?

Posted by Gustaf on Stack Overflow See other posts from Stack Overflow or by Gustaf
Published on 2009-03-26T20:43:34Z Indexed on 2011/06/24 8:22 UTC
Read the original article Hit count: 213

Filed under:

arguments

|

c++0x

|

bind

|

tuple

|

tr1

Consider the case of a templated function with variadic template arguments:

template<typename Tret, typename... T> Tret func(const T&... t);

Now, I have a tuple t of values. How do I call func() using the tuple values as arguments? I've read about the bind() function object, with call() function, and also the apply() function in different some now-obsolete documents. The GNU GCC 4.4 implementation seems to have a call() function in the bind() class, but there is very little documentation on the subject.

Some people suggest hand-written recursive hacks, but the true value of variadic template arguments is to be able to use them in cases like above.

Does anyone have a solution to is, or hint on where to read about it?

© Stack Overflow or respective owner

Related posts about arguments

C++ Function arguments validation (pointer vs. reference arguments)

as seen on Stack Overflow - Search for 'Stack Overflow'
Hello everyone, What do you consider a better programming practice: passing objects as pointers or references to functions. What do you do for input validation? Thanks. >>> More
How to linebreak long string constructs ?

as seen on Stack Overflow - Search for 'Stack Overflow'
I am editing SQLite SQL statements of substantial length. How can I break these into several lines to allow comfortablt editing? const char *sql = "SELECT arguments arguments arguments arguments arguments arguments arguments arguments arguments arguments FROM a, b, WHERE condition condition condition… >>> More
"TypeError: CreateText() takes exactly 8 arguments (5 given)" with default arguments

as seen on Stack Overflow - Search for 'Stack Overflow'
def CreateText(win, text, x, y, size, font, color, style): txtObject = Text(Point(x,y), text) if size==None: txtObject.setSize(12) else: txtObject.setSize(size) if font==None: txtObject.setFace("courier") else: txtObject.setFace(font) if color==None: … >>> More
Avoiding new operator in JavaScript -- the better way

as seen on Programmers - Search for 'Programmers'
Warning: This is a long post. Let's keep it simple. I want to avoid having to prefix the new operator every time I call a constructor in JavaScript. This is because I tend to forget it, and my code screws up badly. The simple way around this is this... function Make(x) { if ( !(this instanceof… >>> More
Writting this Bash Script to accept Arguments?

as seen on Super User - Search for 'Super User'
How would I go about converting this bash script: mkdir /store/sftp/%USERNAME% sudo useradd -d /incoming %USERNAME% sudo passwd %USERNAME% ## Password needs to be typed or passed in here sudo usermod -g sftp %USERNAME% sudo usermod -s /bin/false %USERNAME% sudo chmod 755 /store/sftp/%USERNAME% sudo… >>> More

Related posts about c++0x

g++ C++0x enum class Compiler Warnings

as seen on Stack Overflow - Search for 'Stack Overflow'
I've been refactoring my horrible mess of C++ type-safe psuedo-enums to the new C++0x type-safe enums because they're way more readable. Anyway, I use them in exported classes, so I explicitly mark them to be exported: enum class __attribute__((visibility("default"))) MyEnum : unsigned int { … >>> More
Any implementations of C++0x out there?

as seen on Stack Overflow - Search for 'Stack Overflow'
Other than Microsoft's upcoming VC10? >>> More
C++0x - When?

as seen on Stack Overflow - Search for 'Stack Overflow'
When will C++0x be released? Anyone here know anything? >>> More
Using C++0x Lambda Expressions in Microsoft Visual Studio

as seen on Internet.com - Search for 'Internet.com'
In this C++ tutorial, learn how to utilize Lambda expressions in your C++ Applications. >>> More
Decimal Value is Zero when it should be 0.0x

as seen on Stack Overflow - Search for 'Stack Overflow'
If this was previously talked about, I'm sorry, I had a hard time searching on this. I am calculating a depreciation rate. One portion of our calculation is 1/life in months. My table stores this data in a decimal field. I tried test = 1 / estimatedLife; but the result of the calculation of test… >>> More