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  • Function-Local Static Const variable Initialization semantics.

    - by Hassan Syed
    The questions are in bold, for those that cannot be bothered reading a question in depth. This is a followup to this question. It is to do with the initialization semantics of static variables in functions. Static variables should be initialized once, and their internal state might be altered later - as I (currently) do in the linked question. However, the code in question does not require the feature to change the state of the variable later. Let me clarrify my position, since I don't require the string object's internal state to change. The code is for a trait class for meta programming, and as such would would benifit from a const char * const ptr -- thus Ideally a local cost static const variable is needed. My educated guess is that in this case the string in question will be optimally placed in memory by the link-loader, and that the code is more secure and maps to the intended semantics. This leads to the semantics of such a variable "The C++ Programming language Third Edition -- Stroustrup" does not have anything (that I could find) to say about this matter. All that is said is that the variable is initialized once when the flow of control of the thread first reaches the code. This leads me to ponder if the following code would be sensible, and if not what are the intended semantics ?. #include <iostream> const char * const GetString(const char * x_in) { static const char * const x = x_in; return x; } int main() { const char * const temp = GetString("yahoo"); std::cout << temp << std::endl; const char * const temp2 = GetString("yahoo2"); std::cout << temp2 << std::endl; } The following compiles on GCC and prints "yahoo" twice. Which is what I want -- However it might not be standards compliant (which is why I post this question). It might be more elegant to have two functions, "SetString" and "String" where the latter forwards to the first. If it is standards compliant does someone know of a templates implementation in boost (or elsewhere) ?

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  • Check on null reference

    - by Neir0
    Hello, i have the follow code: searchResults.SearchResultCollection.Add( new SearchResult() { Header = HttpUtility.HtmlDecode( htmlDocument.DocumentNode .SelectSingleNode(initialXPath + "h3") .InnerText), Link = HttpUtility.HtmlDecode( htmlDocument.DocumentNode .SelectSingleNode(initialXPath + "div/cite") .InnerText) } ); Sometimes htmlDocument.DocumentNode.SelectSingleNode(....) returns null and my application crashed with NullReferenceException. Ofcourse i can write code which check returned value on null reference but then code will be overly verbose. What is graceful way to do that?

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  • Setting a variable to undefined

    - by AJ
    Hello, I'm a bit confused about Javascript undefined & null. Firstly what does if (!testvar) actually do? Does it test for undefined and null or just undefined? Secondly, once a variable is defined can I clear it back to undefined (therefore deleting the variable). Thirdly, can I pass undefined as a parameter? e.g: function test(var1, var2, var3) { } test("value1", undefined, "value2") Thanks, AJ

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  • dmenu doesn't set environment variable as per my .bash_profile when running Emacs

    - by proofit404
    I have following ~/.bash_profile [[ -f ~/.bashrc ]] && . ~/.bashrc and ~/.bashrc ### Check for shell interactivity. if [[ $- != *i* ]] ; then return fi ### Nyan-cat prompt. PS1="\`if [ \$? = 0 ]; then echo \[\e[35m\]^_^\[\e[0m\]; else echo \[\e[31m\]O_O\[\e[0m\]; fi\` \$ " ### PATH export PATH=$PATH:$HOME/bin So when I run emacs from terminal all OK. When I start it with dmenu (getenv "PATH") and exec-path variable doesn't contain ~/bin directory. When I do it in xfce with xfrun4 command with same bash configuration all seams to work too. What is the problem with dmenu?

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  • Export enviroment variable Mac

    - by mujer esponja
    Hello, I am starting with spring-roo, so I downloaded it and now I'm trying to export the variable. To get it, I tryed: PATH=$PATH:/Users/myUsr/spring-roo/bin export PATH PATH variable my-Name-3:~ myUsr$ echo $PATH /sw/bin:/sw/sbin:/usr/local/mysql/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/usr/X11/bin:/usr/X11R6/bin:/Users/myUsr/spring-roo/bin In this path (/Users/myUsr/spring-roo/bin), there is roo.sh But then, I can not run the command roo as it is suposed to be. Any idea?? Thanks in advance

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  • How to set up my belongs_to and has_many reference

    - by dagda1
    Hi, I have an ExpenseType object that I have created with the following migration: class CreateExpenseTypes < ActiveRecord::Migration def self.up create_table :expense_types do |t| t.column :name, :string, :null => false t.timestamps end end I can see the table name is the pluralised expense_types. My question is, how do I reference this type in a belongs_to relationship? Is it: belongs_to :expensetype or is it belongs_to :expense_type I do not seem able to set it up correctly. Cheers

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  • StackOverflowException in c# when no local variable in the function

    - by dnkulkarni
    when i do this static void Main() { Main(); } I receive stackoverflow exception. As i have read so far about C# they say ONLY local variable of value types (and short living ones) will go on stack. But here in the code there are no local variable to go on stack then what overflows it ? I know from assembly code line Perspective that reference to Main() will go on stack too ? Is that right ?

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  • A reference that is not to 'const' cannot be bound to a non-lvalue

    - by Bert
    Hello, Am struggling a bit with this. Am declaring: BYTE *pImage = NULL; Used in call: m_pMyInterface-GetImage(i, &imageSize, &pImage); Visual C++ 2003 compiler error: error C2664: 'CJrvdInterface::GetImage' : cannot convert parameter 3 from 'BYTE **__w64 ' to 'BYTE **& ' A reference that is not to 'const' cannot be bound to a non-lvalue The method called is defined as: void CMyInterface::GetImage(const int &a_iTileId, ULONG *a_pulImageSize, BYTE** &a_ppbImage) { (...) Any help much appreciated, Bert

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  • hiberate named query variable schema name

    - by Sandeep Jindal
    Hi, Other than default schema, for some SQL queries I need to access a particular schema. The issue is that the name of that particular schema is different for different environments. After goggling I found that using this link I am able to specify the schema name in variable. If that’s true that I have following questions: Will that would for SQL queries in the named query? How to set the value for the variable names? Thanks in advance.

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  • Excel - Linking multiple source spreadsheets with variable amounts of rows to a destination spreadsh

    - by Emilio
    I have multiple source spreadsheets, each with a variable number of rows. An example might be one spreadsheet per bank account, with one row for each transaction, with a date and amount. One spreadsheet might have 30 rows, the other 50, and so on. I want to create another spreadsheet which links to the various source spreadsheets and lists an aggregate of all transactions from all sources. So if 3 source sheets with 30, 50 and 20 rows respectively, the destination sheet would have 100 rows. The number of rows (transactions) in the source sheets can grow or shrink over time. I'd like the destination sheet to show one contiguous list of transactions without gaps (spaces). How can I do this?

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  • To Reference A Generic Method With A Lambda Expression

    - by SDReyes
    It is possible to reference a generic method using a Lambda Expression Object? For example, having: TheObject: public abstract class LambdaExpression : Expression TheMethod (an extension method of LINQ): public static TSource Last<TSource>( this IEnumerable<TSource> source ) I'm trying to create an instance of TheObject, that references to TheMethod. How do you do such thing?

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  • string variable not able to get thevalue

    - by prince23
    hi, i have an variable declated as an object Object obj =e.Row.DataContext; when i go to immediate window and check the value i get like this ?Object obj =e.Row.DataContext; {TempTypeMinus1487405295} People: "7,556,930" Name: "India" string strcounty =obj .Tostring(); now in strcounty i should get as India but i am getting the value as TempTypeMinus1487405295 how can i get the value india in string variable thanks in advance

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  • How are Java ByteBuffer's limit and position variable's updated?

    - by Dummy Derp
    There are two scenarios: writing and reading Writing: Whenever I write something to the ByteBuffer by calling its put(byte[]) method the position variable is incremented as: current position + size of byte[] and limit stays at the max. If, however, I put the data in a view buffer then I will have to, manually, calculate and update the position Before I call the write(ByteBuffer) method of the channel to write something, I will have to flip() the Bytebuffer so that position points to zero and limit points to the last byte that was written to the ByteBuffer. Reading: Whenever I call the read(ByteBuffer) method of a channel to read something, the position variable stays at 0 and the limit variable of the ByteBuffer points to the last byte that was read. So, if the ByteBuffer is smaller than the file being read, the limit variable is pushed to max This means that the ByteBuffer is already flipped and I can proceed to extracting the values from the ByteBuffer. Please, correct me where I am wrong :)

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  • WPF reference style in resource dictionary and use triggers

    - by Taylor
    I have a style defined in a resource dictionary that applies to all ComboBox controls. Within the ComboBox control, I reference the style like so: Style="{DynamicResource MyComboBoxStyle}" This works ok. I want to be able to add some triggers to some of the ComboBox controls. What is a good way to use the style referenced as a dynamic resource yet still be able to add triggers to some of the ComboBox controls?

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  • Make Visual Studios "Add Service Reference" Feature use an existing Class

    - by gencha
    When I add a service reference to my Visual Studio 2010 C# project, a new class for one of the types defined in the WSDL will be generated. A de-facto equivalent definition of that type already exists in our solution in a different assembly. When adding the SoapTypeAttribute to the existing class and replacing the references to the generated class in the generated code, everything runs perfectly and as expected. How would I tell Visual Studio to use the existing class in the generated code?

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  • Error 'duplicate definition' when compiling 2 c files that reference 1 header file

    - by super newbie
    I have two C files and one header that are as follows: Header file header.h: char c = 0; file1.c: #include "header.h" file2.c: #include "header.h" I was warned about 'duplicate definition' when compiling. I understand the cause as the variable c is defined twice in both file1.c and file2.c; however, I do need to reference the header.h in both c files. How should I overcome this issue?

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  • Create list of variable type

    - by Jan
    I am trying to create a list of a certain type. I want to use the List notation but all I know is a "System.Type" The type a have is variable. How can I create a list of a variable type? I want something similar to this code. public IList createListOfMyType(Type myType) { return new List<myType>(); }

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