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How can I add reflection to a C++ application?

...re are some handy macros to help with typed expressions: #define REM(...) __VA_ARGS__ #define EAT(...) // Retrieve the type #define TYPEOF(x) DETAIL_TYPEOF(DETAIL_TYPEOF_PROBE x,) #define DETAIL_TYPEOF(...) DETAIL_TYPEOF_HEAD(__VA_ARGS__) #define DETAIL_TYPEOF_HEAD(x, ...) REM x #define DETAIL_TYP...
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PHP Pass variable to next page

...n cookies. More secure, but not completely secure. Session: //On page 1 $_SESSION['varname'] = $var_value; //On page 2 $var_value = $_SESSION['varname']; Remember to run the session_start(); statement on both these pages before you try to access the $_SESSION array, and also before any output i...
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Javascript replace with reference to matched group?

I have a string, such as hello _there_ . I'd like to replace the two underscores with <div> and </div> respectively, using JavaScript . The output would (therefore) look like hello <div>there</div> . The string might contain multiple pairs of underscores. ...
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Repeat string to certain length

... def repeat_to_length(string_to_expand, length): return (string_to_expand * ((length/len(string_to_expand))+1))[:length] For python3: def repeat_to_length(string_to_expand, length): return (string_to_expand * (int(length/len(s...
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Django ManyToMany filter()

... Just restating what Tomasz said. There are many examples of FOO__in=... style filters in the many-to-many and many-to-one tests. Here is syntax for your specific problem: users_in_1zone = User.objects.filter(zones__id=<id1>) # same thing but using in users_in_1zone = User.object...
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What's the difference between django OneToOneField and ForeignKey?

...) >>> e2 = Engine2.objects.get(name='Wankel') >>> e2.car2_set.all() [<Car2: Mazda>] Model Code from django.db import models class Engine(models.Model): name = models.CharField(max_length=25) def __unicode__(self): return self.name class Car(models.Model)...
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Regex lookahead, lookbehind and atomic groups

...pression.info for more details. Positive lookahead: Syntax: (?=REGEX_1)REGEX_2 Match only if REGEX_1 matches; after matching REGEX_1, the match is discarded and searching for REGEX_2 starts at the same position. example: (?=[a-z0-9]{4}$)[a-z]{1,2}[0-9]{2,3} REGEX_1 is [a-z0-9]{4}$ which...
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Chrome sendrequest error: TypeError: Converting circular structure to JSON

...mit": null, "size": 0, "chunks": [], "writable": true, "readable": false, "_events": { "pipe": [null, null], "error": [null] }, "before": [null], "after": [], "response": { "output": [], "outputEncodings": [], "writable": true, "_last": false, "chunkedEncoding": false, ...
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Cannot resolve the collation conflict between “SQL_Latin1_General_CP1_CI_AS” and “Latin1_General_CI_

... your table(s) has by using this query: SELECT col.name, col.collation_name FROM sys.columns col WHERE object_id = OBJECT_ID('YourTableName') Collations are needed and used when ordering and comparing strings. It's generally a good idea to have a single, unique collation used through...
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How to change the CHARACTER SET (and COLLATION) throughout a database?

... change database collation: ALTER DATABASE <database_name> CHARACTER SET utf8 COLLATE utf8mb4_0900_ai_ci; change table collation: ALTER TABLE <table_name> CONVERT TO CHARACTER SET utf8 COLLATE utf8mb4_0900_ai_ci; change column collation: ALTER TABLE <table_name&g...