symbols

问题 I'm having a problem with breakpoints in the source code of a specific library / framework (new to Xcode - i'm not sure what the correct term is) in a fairly large iOS project. I have all the code for this library. Breakpoints are working fine everywhere else, but in this one specific library, all breakpoints are ignored. I can put a breakpoint in a function called from within one of those source files, and it will trigger, but then the callstack shows "__lldb_unnamed_function" for the

问题 The symbol @ was seen in one the program ,But i could not find why it is used . The syntax is const unsigned char Array_name[] @(INFO_Array+1) = {................}; 回答1: To me, it looks like a compiler flag to disable interpreting the string "INFO_Array+1" as an expression. In C# for example, you can use the @-Operator to tell the compiler to use the following expression as String without trying to evaluate it. A quick googling showed: For example, this line will fail to compile: int new =

问题 I'm trying to put as the title of a plot "P@10" using GnuPlot, using the Helvetica font. What I did was this: set encoding iso_8859_1 set title "P \100 10" The \100 comes from the octal representation of the at symbol in unicode. The final plot, however, replaces the @ with a simple space. Other symbols work as expected. I also tried the matlab script provided here, to look for the @ symbol in at least 4000 different codes, but I couldn't find it. Is this possible, even with another font?

问题 I notice that the character/symbol '`' and '@' is not used as an operator in C/C++, does anyone know the reason or historically why its so? if its really not used, is it safe to define those symbols as another operator/statement using #define? 回答1: Normally, #define only accepts valid identifiers in the macro name - so you cannot do: #define @ at #define @(x) [x] Similarly with back-quote. And you didn't mention '$', which is sometimes allowed in identifiers. There might be a compiler

问题 I am building a shared lib by linking a bunch of code with a static lib (.a) on Linux in C++. I have a method defined in a static library. When I use nm -C to print the symbol in that static library is appears as: Alembic::AbcCoreFactory::v9::IFactory::getArchive(std::string const&, Alembic::AbcCoreFactory::v9::IFactory::CoreType&) The symbol is not defined in the output .so file (the library I am building), but when I list the undefined symbols using nm -uC it prints: Alembic::AbcCoreFactory

问题 In my Rails application I'm sending a complex JSON string that needs to get decoded. That's not the problem I know how. Now before I implement everything I'm trying to access some example JSON structures to see if I can get to all the variables. The problem is that the names can be variable. {"configurations" : [ { "drinks" : [ {"menus" : [ { "hot" : [ {"id":15,"unit":"0.33", "price":"1", "currency":"Euro", "position": 4}, {"id":15,"unit":"0.33", "price":"1", "currency":"Euro", "position": 6}

问题 I want to know whether it is possible to expose goto label within a function to symbol table from C/C++ For instance, I want to make ret label of the following snippet appeared from the symbol table and can be referred using standard APIs such as dlsym(). Thanks for your help in advance! #include <stdio.h> int main () { void *ret_p = &&ret; printf("ret: %p\n", ret_p); goto *ret_p; return 1; ret: return 0; } 回答1: Thanks to Marc Glisse's comment which is about using inline asm that specifies

问题 I'm talking NOT about   but about another symbol " " that looks like " " even in text area, but that's another symbol (splitting the string by space symbol does NOT split "hello world" into two words). 回答1:   or one of those below maybe? http://www.w3.org/TR/html4/sgml/entities.html <!-- General Punctuation --> <!ENTITY ensp CDATA " " -- en space, U+2002 ISOpub --> <!ENTITY emsp CDATA " " -- em space, U+2003 ISOpub --> <!ENTITY thinsp CDATA " " -- thin space, U+2009 ISOpub --> 回答2: in the old

问题 As suggested by the dynamic_reload crate's example, I collected Symbol s instead of extracting them every time, but Symbol requires a lifetime. Using a lifetime changes method signatures and breaks the compatibility with method DynamicReload::update . Is it a valid workaround to use std::mem::transmute to change Symbol 's lifetime to 'static ? extern crate dynamic_reload; use dynamic_reload::{DynamicReload, Lib, Symbol, Search, PlatformName, UpdateState}; use std::sync::Arc; use std::time:

问题 In creating a static object is it possible to rename the symbols at compile time (without changing the code) in a cross platform way? I have recently had objcopy recommended, but linux is not the only target platform it must also work on a mac. I am compiling using gcc, so I was hoping that there was a gcc option of some sort. I have heard about .def files, but this may have been misleading as the information about them that I have found seems to be for windows. Edit: I'm trying to change the