Recent questions tagged C++

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c++ - sprintf %g specifier gives too few digits after point

I'm trying to write floating point vars into my ini file and i encountered a problem with format specifiers. I ... ). Thanks for any help. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Why a std::array is not constant expression when it is the input of a templated function/generic lambda?

(Realted to this other question of mine; if you give a look at that too, I would really appreciate it. ... instead of the generic lambda. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Reducing output of gtest, to look similar to output of cxxtest

I have a set of unit tests using gtest as framework. Build, and execute, and the output looks like this ... ()? or other method?) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - How to implement OpenSSL in Qt?

Trying to use OpenSSL in my Qt project, here is my environment: OS: Win7 32bit Qt: Qt Creator 4.2.1 ... /include Please help me fix this. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Filter the synthesized attribute through a std::map in a boost spirit semantic action

I have a case where I'd like to filter the value that comes up as a synthesized attribute inside of a rule ... or the operator cannot be called See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - How to overload the assignment operator for strings that use custom allocator

I am trying to use boost MultiIndex container in shared memory, I am using the replace function to update the records ... , 0ul>, boost::interprocess::iset_index>] include/boost/in...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Default constructor missing - but I'm not calling it?

I'm writing a C++ application in which I have a Controller class with two nested structs, defined in my header ... how do I fix this error? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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677 views

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c++ - Calling callback from node.js native code

I'm writing an add-on for node.js using c++. here some snippets: class Client : public node::ObjectWrap, ... callback Call() thanks in advice See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - cpp gdb valgrind - memory usage statistic while app is running and valgrind unhandled syscall

1) I want to get information about memory usage while my program is running (by request). My program create ... sorry for my english, please. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - QTimer to execute method every second

I'm learning Qt and I was reading about Threads, Events and QObjects from Qt wiki, and followed the wiki ... get any output from the events See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Is the order of items in a hash_map/unordered_map stable?

Is it guaranteed that when a hash_map/unordered_map is loaded with the same items, they will have the same order ... be identified by the key. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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850 views

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c++ - Decoding Hex Encoded Value with Crypto++

I'm new to Cryptopp and I wanted to encode text and decode back to understand how it works. The encoding ... CryptoPP::StringSink(decoded))); See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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462 views

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c++ - Why is __ARM_FEATURE_CRC32 not being defined by the compiler?

I've been working on this issue for some time now, and I hope someone can point out ... 4 #define __ARM_SIZEOF_WCHAR_T 4 See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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650 views

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c++ - Simple Encrypted Arithmetic Library (SEAL) and the seal::Ciphertext variable

I'm using the Simple Encrypted Arithmetic Library (SEAL) library from Microsoft Cryptography Research Group. ... .3.1SEALsealciphertext.cpp See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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589 views

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c++ - utf8 in libharu: is embedding fonts really necessary?

I'm trying to support as much Unicode as I can in the PDF files I'm writing. I want to be able to output ... to embed big fonts in my file. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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562 views

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c++ - memory_order_relaxed and visibility

Consider two threads, T1 and T2, that store and load an atomic integer a_i respectively. And let's further assume ... value 7 after the load? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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564 views

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c++ - adding timer to game

I am making a game program in turbo c++ for my project and I need help on how to add a game timer, I've seen videos ... } } } while(s != 0); } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - What does boost::geometry::intersection return

The documentation for boost::geometry::intersection( https://www.boost.org/doc/libs/1_73_0/libs/geometry/doc/ ... return of true indicating? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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703 views

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c++ - Events is SFML. Switch statement VS if statement

I have some code like this: while(window.pollEvent(event) { //checking events... } My question is, should ... SFML and more readable for others? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - GetLogicalDrives() for loop

I am new to the win32 api and need help trying to understand how the GetLogicalDrives() function works. I am trying ... 0, (LPARAM)drives); } } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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662 views

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c++ - how to warp texture in openGL? (Perspective correction?)

I wanna make the OpenGL program can present images and warp the images presented. Although I achieved image ... to warp texture image? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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697 views

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c++ - "long int", "long long" Data Types

What is the purpose of these new data types? I will normally just use an "int" or a "long" but why do ... new function or purpose do they bring? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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665 views

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c++ - Why would multiple shared pointers pointing to the same memory cause memory leak?

I am reading about shared pointers and the book say that it is bad idea having multiple shared pointers point ... t both shared_ptr know this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - reading hex values from fstream into int

I have a text file which has one hex value in each line. Something like 80000000 08000000 0a000000 Now i am ... array with the int equivalent. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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671 views

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c++ - read and write from files or from cin and cout

my code work good when the argc is 1 but when I try to read and write from files (when argc is 3) the program not ... << endl; } } return 0; } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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651 views

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c++ - How to de/serialize a map with template class using boost::multiprecision::mpq_rational

I have the following template class: #include <map> #include <boost/array.hpp> #include <boost/serialization/map ... with mpq_rational? Thanks, See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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602 views

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c++ - Does "try-catch" catches run time error (especially Out of Range error)

I'm following an example code from Programming Principles and Practice Using C++ in one of the example for exception ... why it shows me this See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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655 views

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c++ - Copying (using assignment) a structure to a structure inside a union causing seg fault

I wrote the following code: #include <iostream> #include <string> #include <cstring> struct bar { std::string s3 ... in the back trace suggests. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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