What's the difference between # , % and $ signs in Struts tags?
Use of # (pound sign) OGNL is used to refer to objects in the ActionContext as follows: objectName: object in the ValueStack (default/root object in the OGNL context), such as an Action property #objectName: object in the ActionContext but outside of the ValueStack, specifically... #objectName: ActionContext object that has been created using the Struts2 data tags with the default action scope (e.
Why does the C preprocessor interpret the word "linux" as the constant "1"?
Why does the C preprocessor in GCC interpret the word linux (small letters) as the constant 1? test.c: #include <stdio.h> int main(void) { int linux = 5; return 0; } Result of $ gcc -E test.c (stop after the preprocessing stage): .... int main(void) { int 1 = 5; return 0; } Which of course yields an error. (BTW: There is no #define linux in the stdio.h file.)
Resolving ambiguous overload on function pointer and std::function for a lambda using + (unary plus)
Why is this program erroneously rejected by three C++ compilers?
I am having some difficulty compiling a C++ program that I've written. This program is very simple and, to the best of my knowledge, conforms to all the rules set forth in the C++ Standard. I've read over the entirety of ISO/IEC 14882:2003 twice to be sure. The program is as follows: Here is the output I received when trying to compile this program with Visual C++ 2010: c:\dev>cl /nologo helloworl
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