According to shared_ptr/atomic, we know that shared_ptr::reset() is thread-safe. To prevent the object being accessed by other threads from being released. I create a store ptr to preserve the expired object. So, the following codes are thread safe in any of time? class data_info { shared_ptr<sample> using; shared_ptr<sample> store; } // function1 and function2 are ..
Category : c++
My code: const int N = 1048569; struct A { }; struct B : virtual public A { char space[N]; }; struct C : virtual public A { void foo() {}; }; struct D : public B, public C { }; D T; int main() { T.foo(); return 0; } When I compile my code ..
I am making a https file downloader in C++ using Sockets and OpenSSL. The downloader is working fine i.e. it is getting the data from the server. But the problem is that I want to know more details about the file to be downloaded, mainly I want the name and size of the file. This ..
#include <iostream> using namespace std; struct Fraction { int numerator; int denominator; }; int simplify(int numerator, int denominator) { for (int i = denominator * numerator; i > 1; i–) { if ((denominator % i == 0) && (numerator % i == 0)) { denominator /= i; numerator /= i; } } } int output ..
To display the contents of a vector of vector in C++, we use nested for loops. Something like this: for (auto i = 0; i < x.size(); i++) { for (auto j = 0; j < x[i].size(); j++) std :: cout << x[i][j] << " "; std :: cout << std :: endl; } (Here ..
First, I’ll start with what does work: struct A { int a, b; }; struct S { A A_;// Member can be defined elsewhere. struct B { int c, d; };// Member can be defined locally. B B_; struct C { int e, f; } C_;// Member can be instanced on the same line… C ..
I found that there has a different execution order between two similar statements(the only difference is the below one has a more ‘;’). The destructor order is different. Does C++ has corresponding specification about that or it’s only a unspecified behavior? Environment: GCC10 #include <iostream> template <int num> struct S { S() {std::cout << "S(" ..
I’m using Visual Studio Code, my language is C++. Lets say I have classes A and B. B is a child class of A. When I try and call methods of instantiated B object, specifically methods inherited from class A, VS code doesn’t suggest methods inherited from A, only methods I’ve written for B. How ..
I want to read the Xgboost source code and run the `parameter.cc on mac. this is my command: cd dmlc-core/example gcc -std=c++11 -I ../include parameter.cc -o parameter -v But it throws exceptions ld: symbol(s) not found for architecture x86_64. Anyone knows how to fix it? Thanks advance! Below is the stacktrace,due to the question body ..
I wanted to do something like this in C++ if(x.equalsIgnoreCase("abc")) { //… } Is there an equivalent function in C++ for equalsIgnoreCase in Java? Source: Windows Que..
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