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在分析程序时,我遇到了valgrind报告的奇怪错误。你能帮我找到他们的来源吗?
最小示例
main.cpp:
#define BOOST_ASIO_ENABLE_HANDLER_TRACKING
#include "foo.h"
#include <iostream>
int main()
{
boost::asio::io_service ioService;
Foo foo(ioService);
ioService.run();
return EXIT_SUCCESS;
}
#include <boost/asio.hpp>
class Foo
{
private:
boost::asio::ip::tcp::resolver resolver_;
public:
Foo(boost::asio::io_service & ioService);
virtual ~Foo()
{}
};
#include "foo.h"
Foo::Foo(boost::asio::io_service & ioService) : resolver_(ioService)
{
}
g++ -g3 -O0 -lboost_system -lpthread -o main ./main.cpp ./foo.cpp
编译并用
valgrind ./main
执行时,valgrind报告类型无效的
5 errors。
==14905== Memcheck, a memory error detector
==14905== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
==14905== Using Valgrind-3.15.0 and LibVEX; rerun with -h for copyright info
==14905== Command: ./main
==14905==
==14905== Invalid write of size 1
==14905== at 0x406724: boost::asio::detail::scheduler::scheduler(boost::asio::execution_context&, int) (scheduler.ipp:103)
==14905== by 0x40CBF6: boost::asio::io_context::io_context(int) (io_context.ipp:44)
==14905== by 0x40CE22: boost::asio::detail::resolver_service_base::resolver_service_base(boost::asio::io_context&) (resolver_service_base.ipp:40)
==14905== by 0x40DC6A: boost::asio::detail::resolver_service<boost::asio::ip::tcp>::resolver_service(boost::asio::io_context&) (resolver_service.hpp:58)
==14905== by 0x40DA56: boost::asio::execution_context::service* boost::asio::detail::service_registry::create<boost::asio::detail::resolver_service<boost::asio::ip::tcp>, boost::asio::io_context>(void*) (service_registry.hpp:87)
==14905== by 0x40C88F: boost::asio::detail::service_registry::do_use_service(boost::asio::execution_context::service::key const&, boost::asio::execution_context::service* (*)(void*), void*) (service_registry.ipp:132)
==14905== by 0x40D86D: boost::asio::detail::resolver_service<boost::asio::ip::tcp>& boost::asio::detail::service_registry::use_service<boost::asio::detail::resolver_service<boost::asio::ip::tcp> >(boost::asio::io_context&) (service_registry.hpp:39)
==14905== by 0x40D6A0: boost::asio::detail::resolver_service<boost::asio::ip::tcp>& boost::asio::use_service<boost::asio::detail::resolver_service<boost::asio::ip::tcp> >(boost::asio::io_context&) (io_context.hpp:39)
==14905== by 0x40D596: boost::asio::basic_io_object<boost::asio::detail::resolver_service<boost::asio::ip::tcp>, true>::basic_io_object(boost::asio::io_context&) (basic_io_object.hpp:224)
==14905== by 0x40D498: boost::asio::ip::basic_resolver<boost::asio::ip::tcp>::basic_resolver(boost::asio::io_context&) (basic_resolver.hpp:101)
==14905== by 0x40C544: Foo::Foo(boost::asio::io_context&) (foo.cpp:3)
==14905== by 0x402D79: main (main.cpp:10)
==14905== Address 0x5f06110 is 0 bytes after a block of size 240 alloc'd
==14905== at 0x4C2E94F: operator new(unsigned long) (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
==14905== by 0x40CBE1: boost::asio::io_context::io_context(int) (io_context.ipp:44)
==14905== by 0x40CE22: boost::asio::detail::resolver_service_base::resolver_service_base(boost::asio::io_context&) (resolver_service_base.ipp:40)
==14905== by 0x40DC6A: boost::asio::detail::resolver_service<boost::asio::ip::tcp>::resolver_service(boost::asio::io_context&) (resolver_service.hpp:58)
==14905== by 0x40DA56: boost::asio::execution_context::service* boost::asio::detail::service_registry::create<boost::asio::detail::resolver_service<boost::asio::ip::tcp>, boost::asio::io_context>(void*) (service_registry.hpp:87)
==14905== by 0x40C88F: boost::asio::detail::service_registry::do_use_service(boost::asio::execution_context::service::key const&, boost::asio::execution_context::service* (*)(void*), void*) (service_registry.ipp:132)
==14905== by 0x40D86D: boost::asio::detail::resolver_service<boost::asio::ip::tcp>& boost::asio::detail::service_registry::use_service<boost::asio::detail::resolver_service<boost::asio::ip::tcp> >(boost::asio::io_context&) (service_registry.hpp:39)
==14905== by 0x40D6A0: boost::asio::detail::resolver_service<boost::asio::ip::tcp>& boost::asio::use_service<boost::asio::detail::resolver_service<boost::asio::ip::tcp> >(boost::asio::io_context&) (io_context.hpp:39)
==14905== by 0x40D596: boost::asio::basic_io_object<boost::asio::detail::resolver_service<boost::asio::ip::tcp>, true>::basic_io_object(boost::asio::io_context&) (basic_io_object.hpp:224)
==14905== by 0x40D498: boost::asio::ip::basic_resolver<boost::asio::ip::tcp>::basic_resolver(boost::asio::io_context&) (basic_resolver.hpp:101)
==14905== by 0x40C544: Foo::Foo(boost::asio::io_context&) (foo.cpp:3)
==14905== by 0x402D79: main (main.cpp:10)
==14905==
==14905== Invalid write of size 1
==14905== at 0x40672F: boost::asio::detail::scheduler::scheduler(boost::asio::execution_context&, int) (scheduler.ipp:103)
==14905== by 0x40CBF6: boost::asio::io_context::io_context(int) (io_context.ipp:44)
==14905== by 0x40CE22: boost::asio::detail::resolver_service_base::resolver_service_base(boost::asio::io_context&) (resolver_service_base.ipp:40)
==14905== by 0x40DC6A: boost::asio::detail::resolver_service<boost::asio::ip::tcp>::resolver_service(boost::asio::io_context&) (resolver_service.hpp:58)
==14905== by 0x40DA56: boost::asio::execution_context::service* boost::asio::detail::service_registry::create<boost::asio::detail::resolver_service<boost::asio::ip::tcp>, boost::asio::io_context>(void*) (service_registry.hpp:87)
==14905== by 0x40C88F: boost::asio::detail::service_registry::do_use_service(boost::asio::execution_context::service::key const&, boost::asio::execution_context::service* (*)(void*), void*) (service_registry.ipp:132)
==14905== by 0x40D86D: boost::asio::detail::resolver_service<boost::asio::ip::tcp>& boost::asio::detail::service_registry::use_service<boost::asio::detail::resolver_service<boost::asio::ip::tcp> >(boost::asio::io_context&) (service_registry.hpp:39)
==14905== by 0x40D6A0: boost::asio::detail::resolver_service<boost::asio::ip::tcp>& boost::asio::use_service<boost::asio::detail::resolver_service<boost::asio::ip::tcp> >(boost::asio::io_context&) (io_context.hpp:39)
==14905== by 0x40D596: boost::asio::basic_io_object<boost::asio::detail::resolver_service<boost::asio::ip::tcp>, true>::basic_io_object(boost::asio::io_context&) (basic_io_object.hpp:224)
==14905== by 0x40D498: boost::asio::ip::basic_resolver<boost::asio::ip::tcp>::basic_resolver(boost::asio::io_context&) (basic_resolver.hpp:101)
==14905== by 0x40C544: Foo::Foo(boost::asio::io_context&) (foo.cpp:3)
==14905== by 0x402D79: main (main.cpp:10)
==14905== Address 0x5f06111 is 1 bytes after a block of size 240 alloc'd
==14905== at 0x4C2E94F: operator new(unsigned long) (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
==14905== by 0x40CBE1: boost::asio::io_context::io_context(int) (io_context.ipp:44)
==14905== by 0x40CE22: boost::asio::detail::resolver_service_base::resolver_service_base(boost::asio::io_context&) (resolver_service_base.ipp:40)
==14905== by 0x40DC6A: boost::asio::detail::resolver_service<boost::asio::ip::tcp>::resolver_service(boost::asio::io_context&) (resolver_service.hpp:58)
==14905== by 0x40DA56: boost::asio::execution_context::service* boost::asio::detail::service_registry::create<boost::asio::detail::resolver_service<boost::asio::ip::tcp>, boost::asio::io_context>(void*) (service_registry.hpp:87)
==14905== by 0x40C88F: boost::asio::detail::service_registry::do_use_service(boost::asio::execution_context::service::key const&, boost::asio::execution_context::service* (*)(void*), void*) (service_registry.ipp:132)
==14905== by 0x40D86D: boost::asio::detail::resolver_service<boost::asio::ip::tcp>& boost::asio::detail::service_registry::use_service<boost::asio::detail::resolver_service<boost::asio::ip::tcp> >(boost::asio::io_context&) (service_registry.hpp:39)
==14905== by 0x40D6A0: boost::asio::detail::resolver_service<boost::asio::ip::tcp>& boost::asio::use_service<boost::asio::detail::resolver_service<boost::asio::ip::tcp> >(boost::asio::io_context&) (io_context.hpp:39)
==14905== by 0x40D596: boost::asio::basic_io_object<boost::asio::detail::resolver_service<boost::asio::ip::tcp>, true>::basic_io_object(boost::asio::io_context&) (basic_io_object.hpp:224)
==14905== by 0x40D498: boost::asio::ip::basic_resolver<boost::asio::ip::tcp>::basic_resolver(boost::asio::io_context&) (basic_resolver.hpp:101)
==14905== by 0x40C544: Foo::Foo(boost::asio::io_context&) (foo.cpp:3)
==14905== by 0x402D79: main (main.cpp:10)
==14905==
==14905== Invalid write of size 4
==14905== at 0x40673D: boost::asio::detail::scheduler::scheduler(boost::asio::execution_context&, int) (scheduler.ipp:103)
==14905== by 0x40CBF6: boost::asio::io_context::io_context(int) (io_context.ipp:44)
==14905== by 0x40CE22: boost::asio::detail::resolver_service_base::resolver_service_base(boost::asio::io_context&) (resolver_service_base.ipp:40)
==14905== by 0x40DC6A: boost::asio::detail::resolver_service<boost::asio::ip::tcp>::resolver_service(boost::asio::io_context&) (resolver_service.hpp:58)
==14905== by 0x40DA56: boost::asio::execution_context::service* boost::asio::detail::service_registry::create<boost::asio::detail::resolver_service<boost::asio::ip::tcp>, boost::asio::io_context>(void*) (service_registry.hpp:87)
==14905== by 0x40C88F: boost::asio::detail::service_registry::do_use_service(boost::asio::execution_context::service::key const&, boost::asio::execution_context::service* (*)(void*), void*) (service_registry.ipp:132)
==14905== by 0x40D86D: boost::asio::detail::resolver_service<boost::asio::ip::tcp>& boost::asio::detail::service_registry::use_service<boost::asio::detail::resolver_service<boost::asio::ip::tcp> >(boost::asio::io_context&) (service_registry.hpp:39)
==14905== by 0x40D6A0: boost::asio::detail::resolver_service<boost::asio::ip::tcp>& boost::asio::use_service<boost::asio::detail::resolver_service<boost::asio::ip::tcp> >(boost::asio::io_context&) (io_context.hpp:39)
==14905== by 0x40D596: boost::asio::basic_io_object<boost::asio::detail::resolver_service<boost::asio::ip::tcp>, true>::basic_io_object(boost::asio::io_context&) (basic_io_object.hpp:224)
==14905== by 0x40D498: boost::asio::ip::basic_resolver<boost::asio::ip::tcp>::basic_resolver(boost::asio::io_context&) (basic_resolver.hpp:101)
==14905== by 0x40C544: Foo::Foo(boost::asio::io_context&) (foo.cpp:3)
==14905== by 0x402D79: main (main.cpp:10)
==14905== Address 0x5f06114 is 4 bytes after a block of size 240 alloc'd
==14905== at 0x4C2E94F: operator new(unsigned long) (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
==14905== by 0x40CBE1: boost::asio::io_context::io_context(int) (io_context.ipp:44)
==14905== by 0x40CE22: boost::asio::detail::resolver_service_base::resolver_service_base(boost::asio::io_context&) (resolver_service_base.ipp:40)
==14905== by 0x40DC6A: boost::asio::detail::resolver_service<boost::asio::ip::tcp>::resolver_service(boost::asio::io_context&) (resolver_service.hpp:58)
==14905== by 0x40DA56: boost::asio::execution_context::service* boost::asio::detail::service_registry::create<boost::asio::detail::resolver_service<boost::asio::ip::tcp>, boost::asio::io_context>(void*) (service_registry.hpp:87)
==14905== by 0x40C88F: boost::asio::detail::service_registry::do_use_service(boost::asio::execution_context::service::key const&, boost::asio::execution_context::service* (*)(void*), void*) (service_registry.ipp:132)
==14905== by 0x40D86D: boost::asio::detail::resolver_service<boost::asio::ip::tcp>& boost::asio::detail::service_registry::use_service<boost::asio::detail::resolver_service<boost::asio::ip::tcp> >(boost::asio::io_context&) (service_registry.hpp:39)
==14905== by 0x40D6A0: boost::asio::detail::resolver_service<boost::asio::ip::tcp>& boost::asio::use_service<boost::asio::detail::resolver_service<boost::asio::ip::tcp> >(boost::asio::io_context&) (io_context.hpp:39)
==14905== by 0x40D596: boost::asio::basic_io_object<boost::asio::detail::resolver_service<boost::asio::ip::tcp>, true>::basic_io_object(boost::asio::io_context&) (basic_io_object.hpp:224)
==14905== by 0x40D498: boost::asio::ip::basic_resolver<boost::asio::ip::tcp>::basic_resolver(boost::asio::io_context&) (basic_resolver.hpp:101)
==14905== by 0x40C544: Foo::Foo(boost::asio::io_context&) (foo.cpp:3)
==14905== by 0x402D79: main (main.cpp:10)
==14905==
@asio|1589278153.511608|0|resolver@0x1ffefff910.cancel
==14905== Invalid write of size 1
==14905== at 0x406D20: boost::asio::detail::scheduler::stop_all_threads(boost::asio::detail::conditionally_enabled_mutex::scoped_lock&) (scheduler.ipp:543)
==14905== by 0x406A9E: boost::asio::detail::scheduler::stop() (scheduler.ipp:257)
==14905== by 0x40CC67: boost::asio::io_context::stop() (io_context.ipp:121)
==14905== by 0x40CF79: boost::asio::detail::resolver_service_base::base_shutdown() (resolver_service_base.ipp:58)
==14905== by 0x40DFD9: boost::asio::detail::resolver_service<boost::asio::ip::tcp>::shutdown() (resolver_service.hpp:65)
==14905== by 0x405335: boost::asio::detail::service_registry::shutdown_services() (service_registry.ipp:44)
==14905== by 0x40568C: boost::asio::execution_context::shutdown() (execution_context.ipp:41)
==14905== by 0x405630: boost::asio::execution_context::~execution_context() (execution_context.ipp:34)
==14905== by 0x4070A1: boost::asio::io_context::~io_context() (io_context.ipp:55)
==14905== by 0x402DA2: main (main.cpp:9)
==14905== Address 0x5f06110 is 0 bytes after a block of size 240 alloc'd
==14905== at 0x4C2E94F: operator new(unsigned long) (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
==14905== by 0x40CBE1: boost::asio::io_context::io_context(int) (io_context.ipp:44)
==14905== by 0x40CE22: boost::asio::detail::resolver_service_base::resolver_service_base(boost::asio::io_context&) (resolver_service_base.ipp:40)
==14905== by 0x40DC6A: boost::asio::detail::resolver_service<boost::asio::ip::tcp>::resolver_service(boost::asio::io_context&) (resolver_service.hpp:58)
==14905== by 0x40DA56: boost::asio::execution_context::service* boost::asio::detail::service_registry::create<boost::asio::detail::resolver_service<boost::asio::ip::tcp>, boost::asio::io_context>(void*) (service_registry.hpp:87)
==14905== by 0x40C88F: boost::asio::detail::service_registry::do_use_service(boost::asio::execution_context::service::key const&, boost::asio::execution_context::service* (*)(void*), void*) (service_registry.ipp:132)
==14905== by 0x40D86D: boost::asio::detail::resolver_service<boost::asio::ip::tcp>& boost::asio::detail::service_registry::use_service<boost::asio::detail::resolver_service<boost::asio::ip::tcp> >(boost::asio::io_context&) (service_registry.hpp:39)
==14905== by 0x40D6A0: boost::asio::detail::resolver_service<boost::asio::ip::tcp>& boost::asio::use_service<boost::asio::detail::resolver_service<boost::asio::ip::tcp> >(boost::asio::io_context&) (io_context.hpp:39)
==14905== by 0x40D596: boost::asio::basic_io_object<boost::asio::detail::resolver_service<boost::asio::ip::tcp>, true>::basic_io_object(boost::asio::io_context&) (basic_io_object.hpp:224)
==14905== by 0x40D498: boost::asio::ip::basic_resolver<boost::asio::ip::tcp>::basic_resolver(boost::asio::io_context&) (basic_resolver.hpp:101)
==14905== by 0x40C544: Foo::Foo(boost::asio::io_context&) (foo.cpp:3)
==14905== by 0x402D79: main (main.cpp:10)
==14905==
==14905== Invalid write of size 1
==14905== at 0x4067E2: boost::asio::detail::scheduler::shutdown() (scheduler.ipp:111)
==14905== by 0x405335: boost::asio::detail::service_registry::shutdown_services() (service_registry.ipp:44)
==14905== by 0x40568C: boost::asio::execution_context::shutdown() (execution_context.ipp:41)
==14905== by 0x405630: boost::asio::execution_context::~execution_context() (execution_context.ipp:34)
==14905== by 0x4070A1: boost::asio::io_context::~io_context() (io_context.ipp:55)
==14905== by 0x40D37A: boost::asio::detail::scoped_ptr<boost::asio::io_context>::reset(boost::asio::io_context*) (scoped_ptr.hpp:63)
==14905== by 0x40CFD5: boost::asio::detail::resolver_service_base::base_shutdown() (resolver_service_base.ipp:64)
==14905== by 0x40DFD9: boost::asio::detail::resolver_service<boost::asio::ip::tcp>::shutdown() (resolver_service.hpp:65)
==14905== by 0x405335: boost::asio::detail::service_registry::shutdown_services() (service_registry.ipp:44)
==14905== by 0x40568C: boost::asio::execution_context::shutdown() (execution_context.ipp:41)
==14905== by 0x405630: boost::asio::execution_context::~execution_context() (execution_context.ipp:34)
==14905== by 0x4070A1: boost::asio::io_context::~io_context() (io_context.ipp:55)
==14905== Address 0x5f06111 is 1 bytes after a block of size 240 alloc'd
==14905== at 0x4C2E94F: operator new(unsigned long) (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
==14905== by 0x40CBE1: boost::asio::io_context::io_context(int) (io_context.ipp:44)
==14905== by 0x40CE22: boost::asio::detail::resolver_service_base::resolver_service_base(boost::asio::io_context&) (resolver_service_base.ipp:40)
==14905== by 0x40DC6A: boost::asio::detail::resolver_service<boost::asio::ip::tcp>::resolver_service(boost::asio::io_context&) (resolver_service.hpp:58)
==14905== by 0x40DA56: boost::asio::execution_context::service* boost::asio::detail::service_registry::create<boost::asio::detail::resolver_service<boost::asio::ip::tcp>, boost::asio::io_context>(void*) (service_registry.hpp:87)
==14905== by 0x40C88F: boost::asio::detail::service_registry::do_use_service(boost::asio::execution_context::service::key const&, boost::asio::execution_context::service* (*)(void*), void*) (service_registry.ipp:132)
==14905== by 0x40D86D: boost::asio::detail::resolver_service<boost::asio::ip::tcp>& boost::asio::detail::service_registry::use_service<boost::asio::detail::resolver_service<boost::asio::ip::tcp> >(boost::asio::io_context&) (service_registry.hpp:39)
==14905== by 0x40D6A0: boost::asio::detail::resolver_service<boost::asio::ip::tcp>& boost::asio::use_service<boost::asio::detail::resolver_service<boost::asio::ip::tcp> >(boost::asio::io_context&) (io_context.hpp:39)
==14905== by 0x40D596: boost::asio::basic_io_object<boost::asio::detail::resolver_service<boost::asio::ip::tcp>, true>::basic_io_object(boost::asio::io_context&) (basic_io_object.hpp:224)
==14905== by 0x40D498: boost::asio::ip::basic_resolver<boost::asio::ip::tcp>::basic_resolver(boost::asio::io_context&) (basic_resolver.hpp:101)
==14905== by 0x40C544: Foo::Foo(boost::asio::io_context&) (foo.cpp:3)
==14905== by 0x402D79: main (main.cpp:10)
==14905==
==14905==
==14905== HEAP SUMMARY:
==14905== in use at exit: 1 bytes in 1 blocks
==14905== total heap usage: 18 allocs, 17 frees, 79,744 bytes allocated
==14905==
==14905== LEAK SUMMARY:
==14905== definitely lost: 0 bytes in 0 blocks
==14905== indirectly lost: 0 bytes in 0 blocks
==14905== possibly lost: 0 bytes in 0 blocks
==14905== still reachable: 1 bytes in 1 blocks
==14905== suppressed: 0 bytes in 0 blocks
==14905== Rerun with --leak-check=full to see details of leaked memory
==14905==
==14905== For lists of detected and suppressed errors, rerun with: -s
==14905== ERROR SUMMARY: 5 errors from 5 contexts (suppressed: 0 from 0)
BOOST_ASIO_ENABLE_HANDLER_TRACKING
,则不会报告任何错误。 Foo()
的主体位于foo.h中(即,整个代码位于一个编译单元中),则不会报告任何错误。 resolver_
不会报告任何错误。 BOOST_ASIO_ENABLE_HANDLER_TRACKING
,并且它开始崩溃(反复发生),并且valgrind开始报告“无效的写入”错误(随后是“跳转到无效的地址”类型的错误)。
BOOST_ASIO_ENABLE_HANDLER_TRACKING
揭示了boost::asio中的一个错误,该错误导致我的信号成为某些没有宏就被忽略的例程。 最佳答案
我没有看到不可原谅的错误。
我确实看到了可能的ODR违规。全局定义BOOST_ASIO_ENABLE_HANDLER_TRACKING
或根本不定义。就目前而言,您有一个定义它的TU,一个(或多个)没有定义。这是UB。
由于我以前在自己的代码库中遇到过这种特殊情况,因此我已经看过UB,因此,我很确定这是您的问题。
关于c++ - 来自boost::asio的Valgrind错误,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/61750073/
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除了调试之外,是否有任何针对 c、c++ 或 c# 的测试工具,其工作原理类似于将独立函数复制粘贴到某个文本框,然后在其他文本框中输入参数? 最佳答案 也许您会考虑单元测试。我推荐你谷歌测试和谷歌模拟
我想在第二台显示器中移动一个窗口 (HWND)。问题是我尝试了很多方法,例如将分辨率加倍或输入负值,但它永远无法将窗口放在我的第二台显示器上。 关于如何在 C/C++/c# 中执行此操作的任何线索 最
我正在寻找 C/C++/C## 中不同类型 DES 的现有实现。我的运行平台是Windows XP/Vista/7。 我正在尝试编写一个 C# 程序,它将使用 DES 算法进行加密和解密。我需要一些实
很难说出这里要问什么。这个问题模棱两可、含糊不清、不完整、过于宽泛或夸夸其谈,无法以目前的形式得到合理的回答。如需帮助澄清此问题以便重新打开,visit the help center . 关闭 1
有没有办法强制将另一个 窗口置于顶部? 不是应用程序的窗口,而是另一个已经在系统上运行的窗口。 (Windows, C/C++/C#) 最佳答案 SetWindowPos(that_window_ha
假设您可以在 C/C++ 或 Csharp 之间做出选择,并且您打算在 Windows 和 Linux 服务器上运行同一服务器的多个实例,那么构建套接字服务器应用程序的最明智选择是什么? 最佳答案 如
你们能告诉我它们之间的区别吗? 顺便问一下,有什么叫C++库或C库的吗? 最佳答案 C++ 标准库 和 C 标准库 是 C++ 和 C 标准定义的库,提供给 C++ 和 C 程序使用。那是那些词的共同
下面的测试代码,我将输出信息放在注释中。我使用的是 gcc 4.8.5 和 Centos 7.2。 #include #include class C { public:
很难说出这里问的是什么。这个问题是含糊的、模糊的、不完整的、过于宽泛的或修辞性的,无法以目前的形式得到合理的回答。如需帮助澄清此问题以便重新打开它,visit the help center 。 已关
我的客户将使用名为 annoucement 的结构/类与客户通信。我想我会用 C++ 编写服务器。会有很多不同的类继承annoucement。我的问题是通过网络将这些类发送给客户端 我想也许我应该使用
我在 C# 中有以下函数: public Matrix ConcatDescriptors(IList> descriptors) { int cols = descriptors[0].Co
我有一个项目要编写一个函数来对某些数据执行某些操作。我可以用 C/C++ 编写代码,但我不想与雇主共享该函数的代码。相反,我只想让他有权在他自己的代码中调用该函数。是否可以?我想到了这两种方法 - 在
我使用的是编写糟糕的第 3 方 (C/C++) Api。我从托管代码(C++/CLI)中使用它。有时会出现“访问冲突错误”。这使整个应用程序崩溃。我知道我无法处理这些错误[如果指针访问非法内存位置等,
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我有一些 C 代码,将使用 P/Invoke 从 C# 调用。我正在尝试为这个 C 函数定义一个 C# 等效项。 SomeData* DoSomething(); struct SomeData {
这个问题已经有答案了: Why are these constructs using pre and post-increment undefined behavior? (14 个回答) 已关闭 6
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