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HTML Pretty Print for Go (golang)
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Top functions reviewed by kandi - BETA
- Format converts HTML to HTML .
- txtFmt is a wrapper around txt function
- PHPformat converts in a byte array to a string
- isInline returns whether tag is an inline tag .
- isVoid returns true if tag is valid false otherwise .
- PrPrint formats a string according to the format .
- ByPrint formats the input as a byte slice .
- Print formats a reader and returns the resulting bytes .
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hpp Examples and Code Snippets
Community Discussions
Trending Discussions on hpp
QUESTION
In C++20, we got the capability to sleep on atomic variables, waiting for their value to change.
We do so by using the std::atomic::wait method.
Unfortunately, while wait has been standardized, wait_for and wait_until are not. Meaning that we cannot sleep on an atomic variable with a timeout.
Sleeping on an atomic variable is anyway implemented behind the scenes with WaitOnAddress on Windows and the futex system call on Linux.
Working around the above problem (no way to sleep on an atomic variable with a timeout), I could pass the memory address of an std::atomic to WaitOnAddress on Windows and it will (kinda) work with no UB, as the function gets void* as a parameter, and it's valid to cast std::atomic to void*
On Linux, it is unclear whether it's ok to mix std::atomic with futex. futex gets either a uint32_t* or a int32_t* (depending which manual you read), and casting std::atomic to u/int* is UB. On the other hand, the manual says
The uaddr argument points to the futex word. On all platforms, futexes are four-byte integers that must be aligned on a four- byte boundary. The operation to perform on the futex is specified in the futex_op argument; val is a value whose meaning and purpose depends on futex_op.
Hinting that alignas(4) std::atomic should work, and it doesn't matter which integer type is it is as long as the type has the size of 4 bytes and the alignment of 4.
Also, I have seen many places where this trick of combining atomics and futexes is implemented, including boost and TBB.
So what is the best way to sleep on an atomic variable with a timeout in a non UB way? Do we have to implement our own atomic class with OS primitives to achieve it correctly?
(Solutions like mixing atomics and condition variables exist, but sub-optimal)
...ANSWER
Answered 2021-Jun-15 at 20:48You shouldn't necessarily have to implement a full custom atomic API, it should actually be safe to simply pull out a pointer to the underlying data from the atomic and pass it to the system.
Since std::atomic does not offer some equivalent of native_handle like other synchronization primitives offer, you're going to be stuck doing some implementation-specific hacks to try to get it to interface with the native API.
For the most part, it's reasonably safe to assume that first member of these types in implementations will be the same as the T type -- at least for integral values [1]. This is an assurance that will make it possible to extract out this value.
... and casting
std::atomictou/int*is UB
This isn't actually the case.
std::atomic is guaranteed by the standard to be Standard-Layout Type. One helpful but often esoteric properties of standard layout types is that it is safe to reinterpret_cast a T to a value or reference of the first sub-object (e.g. the first member of the std::atomic).
As long as we can guarantee that the std::atomic contains only the u/int as a member (or at least, as its first member), then it's completely safe to extract out the type in this manner:
QUESTION
I am currently trying to build OpenPose. First, I will try to describe the environment and then the error emerging from it. Caffe, being built from source, resides in its entirety in [/Users...]/openpose/3rdparty instead of the usual location (I redact some parts of the filepaths in this post for privacy). All of its include files can be found in [/Users...]/openpose/3rdparty/caffe/include/caffe. After entering this command:
...ANSWER
Answered 2021-Jun-15 at 18:43You are using cmake. The makefiles generated by cmake don't conform to "standard" makefile conventions; in particular they don't use the CXXFLAGS variable.
When you're using cmake, you're not expected to modify the compiler options by changing the invocation of make. Instead, you're expected to modify the compiler options by either editing the CMakeLists.txt file, or else by providing an overridden value to the cmake command line that is used to generate your makefiles.
QUESTION
According to the OpenCV Docs, we can use cv::FileStorage to read/write custom data structure from/to config files (XML, YAML, JSON):
ANSWER
Answered 2021-Jun-15 at 15:05The issue is due to the intruduction of namespace, indeed you can get a similar issue with this code:
QUESTION
I have a pair of iterator, and I would like to use ranges::views::filter(some_predicate) on it (with the pipe operator). AFAIU I should first convert my pair of iterator into a view. I tried to use ranges::subrange(first, last) to do so, but I’m getting horrible error messages.
Note1: I’m using C++14 and range-v3 version 0.9.1 (the last version compatible with gcc-5.5). If the solution differs when using C++17/20 and/or when using C++20 std::ranges, I’m also interested to know what changed.
Note2: I find the documentation of range-v3 severely lacking, so I’m using cppreference.com. If you know a better documentation, I’m very interested.
EDIT:
In my real code, I’m wrapping a java-style legacy iterator (that has a next() method instead of operator++/operator*. I’m wrapping them in a C++-compatible wrapper. Then I tried to convert that wrapper into a view, and finally filter it. I reproduce a minimal example on godbolt. This use iterator_range as suggested, but it still doesn’t compile (see the second edit below).
ANSWER
Answered 2021-Apr-08 at 16:24In ranges-v3, there is iterator_range which you can use to wrap the iterators into a range object.
In C++20, you can use std::span to wrap those iterators into an range object
QUESTION
I've been tasked with porting a piece of legacy software and the client has decided they want to update Boost from 1.34 to 1.75 in the process.
Unfortunately, I'm having this issue show up when compiling:
...ANSWER
Answered 2021-Jun-09 at 10:17I think this is a conflict with third-party headers which we've seen before here:
"xtime: ambiguous symbol" error, when including
In that case reordering the includes worked out. If that doesn't work in your situation, you should work out which library is to blame (usually its the one that contaminates global namespace with (macro) definitions).
And then you can report the defect to the respective maintainers.
QUESTION
I am trying to use thrust with Opencv classes. The final code will be more complicated including using device memory but this simple example does not build successfully.
...ANSWER
Answered 2021-Jun-14 at 14:06As pointed out in the comments, for the code you have shown, you are getting a warning and this warning can be safely ignored.
For usage in CUDA device code:
For a C++ class to be usable in CUDA device code, any relevant member functions that will be used explicitly or implicitly in CUDA device code, must be marked with the __device__ decorator. (There are a few exceptions e.g. for defaulted constructors which don't apply here.)
The OpenCV class you are attempting to use (cv::KeyPoint), doesn't meet these requirements for use in device code. It won't be usable as-is.
There may be a few options:
Recast your work using
cv::KeyPointto use some class that provides similar functionality, that you write yourself, in such a way as to be properly designed and decorated.Perhaps see if OpenCV built with CUDA has an alternate version here (properly designed/decorated) (my guess would be it probably doesn't)
Rewrite OpenCV itself, taking into account all necessary design changes to allow the
cv::KeyPointclass to be usable in device code.As a variant of suggestion 1, copy the relevant data
.responseto a separate set of classes or just a bare array, and do your selection work based on that. The selection work done there can be used to "filter" the original array.
QUESTION
I'm following JetBrains's tutorial on an Apple Silicon computer. I installed boost with MacPorts (sudo port install boost), the version is 1.71 The build of tests.cpp file fails with the following error:
...ANSWER
Answered 2021-Jan-03 at 12:57Add
QUESTION
I am trying to make a class like string(for learning purposes) and i have the following files
var.cpp:
...ANSWER
Answered 2021-Jun-13 at 15:56Rule of 3\5 not followed so returning var from operator= in constructor results in shallow copy of var, The temporal object then gets deleted and it frees memory.
You have to
a) have implement copy constructor;
b) Fix that destructor, because it leaks memory if string is empty (but there is still memory allocated);
c) consider avoiding use of strdup and free and use new\delete and memcpy.
QUESTION
I coded this statement and receiving compilation error. Code :
...ANSWER
Answered 2021-Jun-12 at 04:33I suspect you have a file named c:\mingw\lib\gcc\mingw32\6.3.0\include\c++\ext\pb_ds\detail\resize_policy\hash_standard_resize_policy_imp.hpp0000644. Rename that file to remove the 0000644 from the end of it.
QUESTION
//In file1.hpp
class A
{
protected:
class B
{
public:
B () {};
};
};
// In file2.hpp
class C
{
public:
void getValue()
{
D obj; ---- error: no matching function for call to D
printf("%d\n",obj.c);
}
class D : public A::B
{
friend class C; -- I tried writing this but still no luck.
public:
D(int a, int b) : c(a), d(b) {}
virtual ~D() {}
//something
private:
int c; int d;
};
class E : public D
{
E() : D(1,2) {}
virtual ~E() {}
};
}
int main()
{
C::E obj;
}
ANSWER
Answered 2021-Jun-11 at 06:15Let take the following example:
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