c++ - ostream operator shouldn't be calling overloaded new operator? -


i reading thinking in c++ (vol 1 - page-597). came across concept of overloading global new/delete operator.

#include <cstdio> #include <cstdlib> using namespace std; void* operator new(size_t sz) {     printf("operator new: %d bytes\n", sz);     void* m = malloc(sz);     if(!m) puts("out of memory");     return m; } void operator delete(void* m) {     puts("operator delete");     free(m); } class s {     int i[100];     public:         s() { puts("s::s()"); }        ~s() { puts("s::~s()"); } }; int main() {     puts("creating & destroying int");     int* p = new int(47);     delete p;     puts("creating & destroying s");     s* s = new s;     delete s;     puts("creating & destroying s[3]");     s* sa = new s[3];     delete []sa; }

taking example says following :-

notice printf( ) , puts( ) used rather iostreams. because when iostream object created (like global cin, cout, , cerr), calls new allocate memory. printf( ), don’t deadlock because doesn’t call new initialize itself.

now check correctness of above statement, included iostream library , added cout statement in conttructor in hope of getting infinite loop expecting cout call new , infinite loop. worked normal. no ambiquity or infinite loop.

am missing here??


Comments

Post a Comment

Popular posts from this blog

asynchronous - C# WinSCP .NET assembly: How to upload multiple files asynchronously -

i using winscp .net assembly uploading files. want upload multiple files asynchronous way. have created method works single upload. public class uploadingdata { private sessionoptions _sessionoptions; private session _session; //connection etc private void onconnected() { foreach (var fileinfo in localfileslist) { var task = task.factory.startnew(() => uploadfilesasync(fileinfo)); } } private async task uploadfilesasync(string file) { string remotefilepath = _session.translatelocalpathtoremote(file, @"/", "/test_data_upload"); var uploading = _session.putfiles(file, remotefilepath, false); //when done await task.run(() => thread.sleep(1000)); } } please suggest me correct way. thanks you can use backgroundworker class this: string[] images = new string[50]; foreach (var path in images) { backgroundworker
Read more

aws api gateway - SerializationException in posting new Records via Dynamodb Proxy Service in API -

i getting "__type": "com.amazon.coral.service#serializationexception" as reply in postman & in test console in api gateway trying post record directly dynamodb using api proxy services.. referring aws article - https://aws.amazon.com/blogs/compute/using-amazon-api-gateway-as-a-proxy-for-dynamodb/ here's mapping { "tablename": "tablenamegoeshere", "item": { "id" : "$context.requestid" "eventname" : "$input.path('$.eventname')", "timestamp" : $input.path('$.timestamp'), "answers": "$util.parsejson($input.path('$.answers'))" } } update: did asked ... , worked if try add array of json objects gives me above same error - here's trying now. please - couldnt find on google well #set($inputroot = $input.path('$')) { "tablename": "answer", "item": {
Read more

asp.net - Problems sending emails from forum -

i have been redesigning site has message board, has been written guy looked after site. it has few problems , written in .asp , uses .mdb files database. you can see whole thing here . feel free post if helps, test thing have set using original files , new database. the basic problem when posts message, supposed email sent them, have posted it. when replies, originator supposed message, replier has been posted. i’d have thought @ point in process there should script/file in postmessage.asp? the postmessage.asp page below. <% option explicit %> <!-- #include virtual="common/adovbs.inc" --> <html> <head> <meta http-equiv="content-type" content="text/html; charset=windows-1252"> <meta name="generator" content="microsoft frontpage 4.0"> <meta name="progid" content="frontpage.editor.document"> <title>new page 2</title> <base target="_self"
Read more