c++ - Strange behavior of const_cast -

-

इस सवाल का पहले से ही एक उत्तर है: < / P>

  • 5 जवाब

    निम्न कोड पर विचार करें: < / P>

    मैं एक नया संदर्भ अंत घोषित करता हूं उसे const_cast के माध्यम से मूल्य के लिए निर्दिष्ट करें। फिर मैं सिर्फ संदर्भ मान को पतों और मूल्यों को प्रिंट करने में वृद्धि करता हूं। 

      #include & lt; iostream & gt; नेमस्पेस एसटीडी का उपयोग करना; Int main () {const int = 7; इंट और बी = कॉन्स्ट-क्वैस्ट & लेफ्टिनेंट; इंटी & amp; & gt; (ए); ++ ख; Cout & lt; & lt; "पते" & lt; & amp; एक & lt; & lt; "" & lt; & lt; और amp; बी & lt; & lt; endl; Cout & lt; & lt; "मान" & lt; & lt; a & lt; "" & lt; & lt; b & lt; & lt; एंडल; } // आउटपुट पते 0x7fff11f8e30c 0x7fff11f8e30c मान 7 8   
     मैं एक ही पते में 2 भिन्न मान कैसे प्राप्त कर सकता हूं ??   
     
     
     एक निरंतर ऑब्जेक्ट को संशोधित करता है, अपरिभाषित व्यवहार देता है, इसलिए आपका प्रोग्राम (सिद्धांत रूप में) कुछ भी कर सकता है।  
     इस व्यवहार को छोड़ने का एक कारण अनिर्धारित है इसके मूल्य के साथ निरंतर चर की जगह के अनुकूलन (जब से आपने कहा है कि मूल्य कभी नहीं बदल सकता है)। यहां ये क्या हो रहा है: समय को संकलित करने पर  a  को मान  7  से बदल दिया जाता है, और इसलिए वह मूल्य रखेगा जो आप इसे रन टाइम पर करते हैं।

Comments

Post a Comment

Popular posts from this blog

Pygame memory leak with transform.flip -

-
Today I came across an interesting issue which, by writing a small side scroller, instead of a sprite sheet, I was planning to use because I lacked a good "packer" for making phantom sheets (and honestly with patience and passion as it is only a test project). Anyway, I showed the animation running on the right of 8 PNG (with transparency). I considered it a good idea to prepare the flipped images to run on the left in the consultant, and the frame is not framed when the game is running (Flip actually consumes a lot of CPU like I Was measured). > To get access to the loop, I get the memory leak self.move_l = [# 8 PNG images with transparency to the right] For the self in IMG. Move_l: self.move_r.append (pygame.transform.flip (img, true, false) error traceback: traceback (most recent Call final): The file "D: \ Python 34 \ _Projects \ efg \ efg.py", in line 196, in the & lt; module & gt; main = master program ((1024, 680)) "D: \ Python ...
Read more

python - Writing Greek in matplotlib labels, titles -

-
Image
I'm trying to write some text for labels, shape titles etc. with my plots, but no benefit till now Has not happened . I do not want to print specific characters (I know how to use special characters), I want to write the entire text in Greek (maybe Unicode and text ' ?). , suggesting that I would like to mention that for some reason I can not get matplotlib to cooperate with Tex (using IPython notebook from Anaconda in Ubuntu 14.10) so that there really is an option Will not be the first. I tried loading the Arial font and it loads successfully but again I get square blocks instead of characters. I import matplotlib.font_manager FM PROP = FM Font Properties (fname = '/ usr / share / fonts / truetype / msttcorefonts / Arial.ttf') And then to display the string I u'Î? ? I ?? Î¿Ï ?? ÎμÎ »second ?? μΠ± i ?? I ± i ?? I ?? Used ο किया? ? Î¿Î¼Î¿Î¯Ï ?? I ?? I · I ?? ' . Ariel is considered to be fully presented to Greek and I have used it many times ...
Read more

cmake set_source_files_properties not working properly -

-
I have a project in which. C is a group of files which need to be compiled as C files, but I need it to be compiled as C ++ code. I tried the solution I found, but did not work as expected. Instead of making filename.c only, it is compiled as C ++, it compiles all the files in my project as C ++ code. Without that call, all the files have been compiled as C. I also tried: set_source_files_properties ($ {FILES_SRC} property languages ​​C) set_source_files_properties (filename.c property languages ​​CFX) Where FILES_SRC variable keeps all my source files. I am CMK 2.8.12 and Visual Studio 11 ARM Generator. Any ideas how can I fix this? I finished compiling the library using C compiler and added a C ++ code to a different library For which I created a C interface so it can be told from my C library.
Read more