Recent questions tagged C++

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c++ - How can I use lto with static libraries?

When I try to build static libraries with -flto, I get undefined reference errors: library.cpp: #include <iostream> ... .1 and binutils 2.24. 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 exactly can wchar_t represent?

According to cppreference.com's doc on wchar_t: wchar_t - type for wide character representation (see wide strings) ... "supported" by wchar_t? 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 can you quickly compute the integer logarithm for any base?

How can I quickly compute the integer logarithm for any base, not just base 10? This question has a really ... generalize that to other bases. 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++ - Shared void pointers. Why does this work?

To solve a very peculiar problem in my application I need a shared-pointer to allocated data, but to the ... compilers? On other platforms? 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's the numerically best way to calculate the average

what's the best way to calculate the average? With this question I want to know which algorithm for calculating the ... files larger than 4 GB). 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 it safe to reinterpret_cast an integer to float?

Note: I mistakenly asked about static_cast originally; this is why the top answer mentions static_cast at first. I ... as portable as possible. 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++ - Get "Access is denied" when trying to compile with g++ from command line. Cygwin

I have installed all packages in cygwin. I have also added C:cygwinin to my PATH variable. But when I ... contact the software publisher.". 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++ - On the use and abuse of alloca

I am working on a soft-realtime event processing system. I would like to minimise as many calls in my code ... malloc_time: 00:00:00.044468 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++ - Initializing from an initializer list, but without {{{{{{{{ ... }}}}}}}}?

I recently stumbles across some problem with initializer lists. Consider a program that stores map-like data struct ... can you think of? 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 ADL the only way to call a friend inline function?

Let us define f, as a friend function of S, inside the declaration of S: struct S { friend void f() {} ... -pointer/std::function/lambda to g? 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++ - Function returning struct as LValue

In the following snippet, why does the line o.margin() = m; compile without fault? It easily deserves a warning, ... Margin is: 0 Margin is: 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 is format specifier for `long double`

I am working on application which works on various flavors of Unix and Windows 32bit and 64bit OS. I am using ... one more time in sprintf()? 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++ - Can't find the tool settings in Eclipse CDT

I am looking to add a few libraries to Eclipse CDT (latest version 8.2). However under the project -> ... download. Thanks for the 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++ - Parallel OpenMP loop with break statement

I know that you cannot have a break statement for an OpenMP loop, but I was wondering if there is any workaround while ... { .... break; } } 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++ - static library, but I still need headers?

I have a bunch of projects that all could share a "common" static library of classes. What confuses me is ... like Adobe deal with 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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344 views

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c++ - How to check if string ends with .txt

I am learning basic C++, and right now I have gotten a string from a user and I want to check if ... regular string, if possible. Any ideas? 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 do Concepts differ from Interfaces?

How do Concepts (ie those recently dropped from the C++0x standard) differ from Interfaces in languages such as Java? 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 the standard say about unaligned memory access?

I've searched through the standard about unaligned access, but didn't find anything (maybe I was inadvertent). Is it ... 1) int; x = 42; 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++ - Producing good add with carry code from clang

I'm trying to produce code (currently using clang++-3.8) that adds two numbers consisting of multiple machine ... it should be something else. 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's the difference between the terms "source file" and "translation unit"?

What's the difference between source file and translation unit? 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++ - Can I use a constexpr value in a lambda without capturing it?

I would want to use a constexpr value in a lambda. Reading the answer to Using lambda captured constexpr value ... in a constant expression ... See Question&Answers more detail:os...

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

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297 views

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c++ - Does casting to a pointer to a template instantiate that template?

static_cast<the_template<int>*>(0) - does this instantiate the_template with type int? The reason for asking is the following ... *>(0), 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++ initial value of dynamic array

I need to dynamically create an array of integer. I've found that when using a static array the syntax int a ... the optimal way to go? 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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c++ - Does D have something akin to C++0x's move semantics?

A problem of "value types" with external resources (like std::vector<T> or std::string) is that ... move semantics or rvalue references? 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 are the typical use cases of an iterator_trait

I am new to C++ so please bear with me. I am trying to understand STL iterator_traits. In the book ... that would be very helpful. See Question&Answers more detail:os...

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

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247 views

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c++ - passing lambda as argument - by reference or value?

I've written a template code that takes a functor as an argument and after some processing, executes it. ... limitations to any of these? See Question&Answers more detail:os...

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

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321 views

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c++ - What is the _REENTRANT flag?

which compiling a multithreaded program we use gcc like below: gcc -lpthread -D_REENTRANT -o someprogram someprogram ... doing over here? 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++ - Does C++11 add the C99 restrict specifier? If not, why not?

restrict is a C99 feature which is getting a lot of attention lately by allowing the compiler to perform " ... specific reason it was omitted? See Question&Answers more detail:os...

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

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