fmt | A modern formatting library | Command Line Interface library

by fmtlib C++ Version: 10.0.0 License: Non-SPDX

X-Ray Key Features Code Snippets Community Discussions(10)Vulnerabilities Install Support

kandi X-RAY | fmt Summary

fmt is a C++ library typically used in Utilities, Command Line Interface applications. fmt has no bugs, it has no vulnerabilities and it has medium support. However fmt has a Non-SPDX License. You can download it from GitHub.

A modern formatting library

Support

Quality

Security

License

Reuse

Support

fmt has a medium active ecosystem.

It has 17123 star(s) with 2072 fork(s). There are 317 watchers for this library.

It had no major release in the last 12 months.

There are 13 open issues and 2241 have been closed. On average issues are closed in 14 days. There are 1 open pull requests and 0 closed requests.

It has a neutral sentiment in the developer community.

The latest version of fmt is 10.0.0

Quality

fmt has 0 bugs and 0 code smells.

Security

fmt has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

fmt code analysis shows 0 unresolved vulnerabilities.

There are 0 security hotspots that need review.

License

fmt has a Non-SPDX License.

Non-SPDX licenses can be open source with a non SPDX compliant license, or non open source licenses, and you need to review them closely before use.

Reuse

fmt releases are available to install and integrate.

It has 7092 lines of code, 111 functions and 87 files.

It has medium code complexity. Code complexity directly impacts maintainability of the code.

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fmt Key Features

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fmt Examples and Code Snippets

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Community Discussions

Trending Discussions on fmt

Go error: cannot use generic type without instantiation

How can I instantiate a new pointer of type argument with generic Go?

interface contains type constraints: cannot use interface in conversion

reverse_iterator weird behavior with 2D arrays

Go Generics - Unions

Why doesn't dereferencing a nil pointer in unsafe.Sizeof() cause a panic?

Docker standard_init_linux.go:228: exec user process caused: no such file or directory

"Cannot use .this" error when using _ for multiple type parameters in method declaration

The pool returned by pgxpool.Connect is nil or becomes nil quickly without error

How to figure out the length of the result of `fmt::format` without running it?

QUESTION

Go error: cannot use generic type without instantiation

Asked 2022-Mar-24 at 17:46

Studying Go generics, I'm running into an error I can't seem to untangle. I've boiled it down to the simplest code:

...

ANSWER

Answered 2022-Feb-26 at 06:13

because you want

t = append(t, 0)

the data type can be int or float group.

this code should work

Source https://stackoverflow.com/questions/71274361

QUESTION

How can I instantiate a new pointer of type argument with generic Go?

Asked 2022-Mar-18 at 20:27

Now that type parameters are available on golang/go:master, I decided to give it a try. It seems that I'm running into a limitation I could not find in the Type Parameters Proposal. (Or I must have missed it).

I want to write a function which returns a slice of values of a generic type with the constraint of an interface type. If the passed type is an implementation with a pointer receiver, how can we instantiate it?

...

ANSWER

Answered 2021-Oct-15 at 01:50

Edit: see blackgreen's answer, which I also found later on my own while scanning through the same documentation they linked. I was going to edit this answer to update based on that, but now I don't have to. :-)

There is probably a better way—this one seems a bit clumsy—but I was able to work around this with reflect:

Source https://stackoverflow.com/questions/69573113

QUESTION

interface contains type constraints: cannot use interface in conversion

Asked 2022-Mar-17 at 15:48

type Number interface {
    int | int64 | float64
}

type NNumber interface {
}

//interface contains type constraints
//type NumberSlice []Number

type NNumberSlice []NNumber

func main() {
    var b interface{}
    b = interface{}(1)
    fmt.Println(b)

    // interface contains type constraints
    // cannot use interface Number in conversion (contains specific type constraints or is comparable)
    //a := []Number{Number(1), Number(2), Number(3), Number(4)}
    //fmt.Println(a)

    aa := []interface{}{interface{}(1), interface{}(2), interface{}(3), 4}
    fmt.Println(aa)

    aaa := []NNumber{NNumber(1), NNumber(2), NNumber(3), 4}
    fmt.Println(aaa)
}

...

ANSWER

Answered 2022-Mar-17 at 15:48

The language specifications explicitly disallow using interfaces with type elements as anything other than type parameter constraints (the quote is under the paragraph Interface types):

Interfaces that are not basic may only be used as type constraints, or as elements of other interfaces used as constraints. They cannot be the types of values or variables, or components of other, non-interface types.

An interface that embeds comparable or another non-basic interface is also non-basic. Your Number interface contains a union, hence it is non-basic too.

A few examples:

Source https://stackoverflow.com/questions/71073365

QUESTION

reverse_iterator weird behavior with 2D arrays

Asked 2022-Mar-15 at 20:06

I have a 2D array. It's perfectly okay to iterate the rows in forward order, but when I do it in reverse, it doesn't work. I cannot figure out why.

I'm using MSVC v143 and the C++20 standard.

...

ANSWER

Answered 2022-Mar-15 at 20:06

This is very likely a code generation bug of MSVC related to pointers to multidimensional arrays: The std::reverse_iterator::operator*() hidden in the range-based loop is essentially doing a *--p, where p is a pointer type to an int[4] pointing to the end of the array. Decrementing and dereferencing in a single statement causes MSVC to load the address of the local variable p instead of the address of the previous element pointed to by the decremented p, essentially resulting in the address of the local variable p being returned.

You can observe the problem better in the following standalone example (https://godbolt.org/z/x9q5M74Md):

Source https://stackoverflow.com/questions/71468722

QUESTION

Go Generics - Unions

Asked 2022-Feb-20 at 19:49

I'm playing around with go generics by modifying a library I created for working with slices. I have a Difference function which accepts slices and returns a list of unique elements only found in one of the slices.

I modified the function to use generics and I'm trying to write unit tests with different types (e.g. strings and ints) but am having trouble with the union type. Here's what I have, now:

...

ANSWER

Answered 2021-Oct-29 at 19:33

I've passed your code through gotip that uses a more evolved implementation of the proposal and it does not complain about that part of the code, so I would assume that the problem is with the go2go initial implementation.

Please note that your implementation will not work since you can definitely use parametric interfaces in type assertion expressions, but you can't use interfaces with type lists as you are doing in testDifference[intOrString]

Source https://stackoverflow.com/questions/69772512

QUESTION

Why doesn't dereferencing a nil pointer in unsafe.Sizeof() cause a panic?

Asked 2022-Feb-10 at 11:32

https://go.dev/play/p/X_BH4qGgXHJ

...

ANSWER

Answered 2022-Feb-10 at 10:08

Spec: Package unsafe:

Calls to Alignof, Offsetof, and Sizeof are compile-time constant expressions of type uintptr.

These functions are evaluated at compile time, no actual dereferencing happens at runtime.

This is possible because the pointed value is not needed, only information about its type is needed, which does not need dereferencing.

It's also documented at unsafe.Sizeof():

The return value of Sizeof is a Go constant.

Constants in Go are compile-time constants.

Also see Spec: Constants:

A constant value is represented by a rune, integer, floating-point, imaginary, or string literal, an identifier denoting a constant, a constant expression, a conversion with a result that is a constant, or the result value of some built-in functions such as unsafe.Sizeof applied to any value, cap or len applied to some expressions, real and imag applied to a complex constant and complex applied to numeric constants.

See similar examples (which without passing them to unsafe.Sizeof() would panic at runtime or block indefinitely, but they work just fine):

Source https://stackoverflow.com/questions/71061359

QUESTION

Docker standard_init_linux.go:228: exec user process caused: no such file or directory

Asked 2022-Feb-08 at 20:49

Whenever I am trying to run the docker images, it is exiting in immediately.

...

ANSWER

Answered 2021-Aug-22 at 15:41

Since you're already using Docker, I'd suggest using a multi-stage build. Using a standard docker image like golang one can build an executable asset which is guaranteed to work with other docker linux images:

Source https://stackoverflow.com/questions/68881023

QUESTION

"Cannot use .this" error when using _ for multiple type parameters in method declaration

Asked 2022-Feb-01 at 13:11

I am playing around with type parameters (generics) using Go 1.18beta1.

Problem

Consider the following snippet:

...

ANSWER

Answered 2022-Feb-01 at 13:11

As mentioned in the comments of the question, the described behavior is a bug in Go 1.18beta1 and is being tracked by issue 50419.

Edit

I have confirmed that the bug in question is fixed in 1.18beta2, which was released on 31 January, 2022.

Source https://stackoverflow.com/questions/70572713

QUESTION

The pool returned by pgxpool.Connect is nil or becomes nil quickly without error

Asked 2021-Dec-23 at 17:31

I have the following code for connecting to a Postgres database:

...

ANSWER

Answered 2021-Dec-21 at 21:47

The issue is that when connecting in a docker-compose network, you have to connect to the hostname of the container, in this case db.

You could also use the other container's IP but would take additional amount of work, it's simpler to just use the hostname.

In other words, you have the wrong connection string, I got this as well when connecting to localhost

Source https://stackoverflow.com/questions/70439214

QUESTION

How to figure out the length of the result of `fmt::format` without running it?

Asked 2021-Dec-10 at 18:34

While answering this question about printing a 2D array of strings into a table, I realized:

I haven't found a better way to determine the length of the result of a fmt::format call that to actually format into a string and check the length of that string.

Is that by design, or is there a more efficient way to go about that? I don't know the internals of fmtlib all too well, but I imagine, the length of the result is known before memory allocation happens. I'd especially like to avoid the memory allocation.

...

ANSWER

Answered 2021-Dec-10 at 18:34

Straight from the API documentation:

Source https://stackoverflow.com/questions/70280141

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Vulnerabilities

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