rental | Rust macro to generate self-referential structs

by jpernst Rust Version: Current License: Non-SPDX

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

kandi X-RAY | rental Summary

rental is a Rust library. rental has no bugs, it has no vulnerabilities and it has low support. However rental has a Non-SPDX License. You can download it from GitHub.

It can sometimes occur in the course of designing an API that it would be convenient, or even necessary, to allow fields within a struct to hold references to other fields within that same struct. Rust's concept of ownership and borrowing is powerful, but can't express such a scenario yet. Creating such a struct manually would require unsafe code to erase lifetime parameters from the field types. Accessing the fields directly would be completely unsafe as a result. This library addresses that issue by allowing access to the internal fields only under carefully controlled circumstances, through closures that are bounded by generic lifetimes to prevent infiltration or exfiltration of any data with an incorrect lifetime. In short, while the struct internally uses unsafe code to store the fields, the interface exposed to the consumer of the struct is completely safe. The implementation of this interface is subtle and verbose, hence the macro to automate the process. The API of this crate consists of the rental macro that generates safe self-referential structs, a few example instantiations to demonstrate the API provided by such structs (see examples), and a module of premade instantiations to cover common use cases (see common).

Support

Quality

Security

License

Reuse

Support

rental has a low active ecosystem.

It has 211 star(s) with 9 fork(s). There are 7 watchers for this library.

It had no major release in the last 6 months.

There are 1 open issues and 40 have been closed. On average issues are closed in 17 days. There are no pull requests.

It has a neutral sentiment in the developer community.

The latest version of rental is current.

Quality

rental has no bugs reported.

Security

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

License

rental 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

rental releases are not available. You will need to build from source code and install.

Installation instructions are not available. Examples and code snippets are available.

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rental Key Features

No Key Features are available at this moment for rental.

rental Examples and Code Snippets

No Code Snippets are available at this moment for rental.

Community Discussions

Trending Discussions on rental

SQL add up numbers to the same country

Columns side by side with css grid

Store values in multidimensional array from BufferedReader

Why is the field value not printing with the println?

Why does this MySQL error near group by statement?

Angular 12 ngx-translate / loader isn't working

How to group different rows in one column?

Regex Match if present does not match a line

How do I search mongodb based off dates?

Power App Reset Button - Resets to Default when I want a blank

QUESTION

SQL add up numbers to the same country

Asked 2021-Jun-13 at 19:21

My friend and I are making a mockup database of a movie rental. We are having trouble with a select command.

A list of all movies, showing how often (number) a movie was rented per nationality of customers. Sorted by frequency (largest first).

We tried by grouping the count(id) however it shows up as single rows

...

ANSWER

Answered 2021-Jun-13 at 19:21

You need to aggregate by the correct columns:

Source https://stackoverflow.com/questions/67961867

QUESTION

Columns side by side with css grid

Asked 2021-Jun-10 at 13:29

I am having a problem understanding how CSS grid works.

I want 3 columns side by side with a specific width and height, but there's a gap between each columns.

...

ANSWER

Answered 2021-Jun-05 at 22:38

You can simply specify the widths that you need in the grid-template-columns property. There is no gap visible between columns.

If you want the red borders you can specify a common class for those divs and just do it once.

Source https://stackoverflow.com/questions/67854299

QUESTION

Store values in multidimensional array from BufferedReader

Asked 2021-Jun-08 at 17:05

I have an assignment for a car rental system which requires the program to read the from a CSV file, which contains each car and its specifications.

I will need to store the values into an array, as I will need to count how many cars are left after one is hired, as well as calculate the cost which is listed for each car.

...

ANSWER

Answered 2021-Jun-06 at 06:01

Splitting by comma, is the right way, you just need to store the the array returned from the split function into an ArrayList or an array of Strings array, like this:

Source https://stackoverflow.com/questions/67856062

QUESTION

Why is the field value not printing with the println?

Asked 2021-Jun-07 at 18:16

I have the following class definition, instance creation, and printing a field of the instance:

...

ANSWER

Answered 2021-Jun-07 at 18:16

This is because you're setting the value of location variable to an empty string. Also, fields in your constructor are unused. Here is how it will look in Java:

Source https://stackoverflow.com/questions/67876238

QUESTION

Why does this MySQL error near group by statement?

Asked 2021-May-27 at 09:37

I want to group my table with mem_num and it appears error saying that :

ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'group by m.mem_num' at line 6.

Here's my code.

...

ANSWER

Answered 2021-May-27 at 09:37

HAVING belongs after the GROUP BY

Source https://stackoverflow.com/questions/67719490

QUESTION

Angular 12 ngx-translate / loader isn't working

Asked 2021-May-27 at 08:10

https://www.npmjs.com/package/@ngx-translate/core https://www.npmjs.com/package/@ngx-translate/http-loader I installed translate package from here and added ngx-translate module with its forRoot , translate service inside component ts (app & header) but it isn't working also

Header component

...

ANSWER

Answered 2021-May-27 at 08:10

The pipe syntax is {{ 'my-translation-key' | translate }} - you have double || in your template, please change and try again.

Alternatively you can inject the translate service and use myTanslation = this.translateService.instant('my-translation-key') if you need to set a variable in your controller.

Source https://stackoverflow.com/questions/67716854

QUESTION

How to group different rows in one column?

Asked 2021-May-27 at 05:30

I have a website for a project that needs to summarize all of the budget categories in one column.

For example I have a column which contains:

Categories:

Water,Electricity,Gas,Rentals,Hospital Fees,Medicine,Personal Care,Fitness,

I want to select the sum of

water,electricity,gas,rentals

and name it as utility bills.

Same as sum of

hospital fees, medicine, personal care, fitness

as healthcare.

What sql statement should i use?

Any help will be appreciated

...

ANSWER

Answered 2021-May-27 at 05:20

You may use conditional aggregation. Like

Source https://stackoverflow.com/questions/67715975

QUESTION

Regex Match if present does not match a line

Asked 2021-May-26 at 07:17

I have a set of strings coming in as:

Site: 4442.001 Rental Charge (x 1) PU094928
Exchange1 x 6m Marrell - Construction &
Emptying of bin1 x 240L - Commercial & PU094928

I want to match it into 3 columns if Site*** presents at the start and if P*** presents in the end else match all of it

I am trying

...

ANSWER

Answered 2021-May-26 at 00:16

the last part, including \s needs to be optional to match the string without it

try

Source https://stackoverflow.com/questions/67696946

QUESTION

How do I search mongodb based off dates?

Asked 2021-May-25 at 09:09

Building a rental listing application using MERN stack. My Listing model is below:

...

ANSWER

Answered 2021-May-25 at 09:09

Doing this directly in the DB is kind of awkward, especially if you're only storing the startDate and endDate for each booking. For example, if someone books a listing from the 1st to the 5th - if another user is searching for the same listing from the 3rd to the 7th, it doesn't match the booking saved, but the listing wouldn't still be counted as available.

I'd suggest taking another look at your model and perhaps even separating out the booked dates to their own documents.

But, keeping with what you have, assuming you're not booking too far in the future, it might be worth storing the bookedDates as a flat array. So if we have a listing booked from the 1st to the 3rd, and the 6th to the 8th, your array would look like this:

Source https://stackoverflow.com/questions/67675419

QUESTION

Power App Reset Button - Resets to Default when I want a blank

Asked 2021-May-24 at 07:27

New to Power Apps . I have a power app linked to a Power BI Record . In this scenario where it brings a rental value from the Power BI Record , initially it should take the value for the customer from the Power BI record . When an user clicks on the RESET button it should blank the text box, but it resets it to the default which is the Power BI Record value . Is there a way to get a value when the form comes up and then when the RESET button is pressed it wipes out the text box instead of going to what is in the DEFAULT property for the text box/ data card in the power app ?

...

ANSWER

Answered 2021-May-24 at 07:27

Please have a look here http://powerappsguide.com/blog/post/controls-how-to-reset-or-clear-data-entry-controls-and-form-values, this very well explains resetting the values.

Source https://stackoverflow.com/questions/67664613

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

Vulnerabilities

No vulnerabilities reported

Install rental

You can download it from GitHub.
Rust is installed and managed by the rustup tool. Rust has a 6-week rapid release process and supports a great number of platforms, so there are many builds of Rust available at any time. Please refer rust-lang.org for more information.

Support

I'm not going to yank the crate because it's still fit for its intended purpose, but as time goes on it will become increasingly out of step with Rust's evolution, so users are encouraged to explore other solutions. I will also not merge any pull requests, as the code is sufficiently complicated that I'm no longer confident in my ability to effectively review them. Rental can be considered "frozen" in its current state, and any further development will need to take place under a fork for whoever wishes to do so.

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