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How to set breakpoints on future shared libraries with a command flag
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With no symbols.
objdump -t /lib/libacl.so
SYMBOL TABLE:
no symbols
objdump -T /lib/libacl.so
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00002bd0 g DF .text 000000d0 ACL_1.0 acl_delete_entry
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(gdb) break 0x0002bd0
(gdb) x/20i acl_delete_entry
0x2bd0 <acl_delete_entry>: stwu r1,-32(r1...
Is the order of iterating through std::map known (and guaranteed by the standard)?
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std::map is a sorted associative container
std::unordered_map is a hash-table based associative container introduced in C++11
So, in order to clarify the guarantees on ordering.
In C++03:
std::set, std::multiset, std::map and std::multimap are guaranteed to be ordered according to the keys (...
Is it possible to set a number to NaN or infinity?
...'t standard-library but a very common third-party library).
The following table summarizes the ways how one can create a not-a-number or a positive or negative infinity float:
╒══════════╤══════════════╤═════════════...
UnboundLocalError on local variable when reassigned after first use
...nitialized. In a fully compiled language, it would just go into the symbol table and wait for the parse, but since it WON'T have the luxury of a second pass, the lexer does a little extra work to make life easier later on. Only, then it sees the OPERATOR, sees that the rules say "if you have an op...
How to get a one-dimensional scalar array as a doctrine dql query result?
I want to get an array of values from the id column of the Auction table.
If this was a raw SQL I would write:
5 Answers
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Seeding the random number generator in Javascript
...334677,s)>>>0)/2**32;
These LCG values are from: P. L'Ecuyer: A table of Linear Congruential Generators of different sizes and good lattice structure, April 30 1997.
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In HTML I can make a checkmark with ✓ . Is there a corresponding X-mark?
...nks. any idea where I can get a reference for these like the ascii lookup tables?
– nc.
Apr 3 '09 at 0:35
1
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Removing index column in pandas when reading a csv
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Using df.to_sql("table",cursor,if_exists="append",index=False) also fixes the sqlite error sqlite3.OperationalError: table message has no column named index
– Anna
Jun 3 '18 at 0:55
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What is the size of column of int(11) in mysql in bytes?
...prefixed with 0s.
The best way to see all the nuances is to run:
CREATE TABLE `mytable` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`int1` int(10) NOT NULL,
`int2` int(3) NOT NULL,
`zf1` int(10) ZEROFILL NOT NULL,
`zf2` int(3) ZEROFILL NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=Inn...
Difference between float and decimal data type
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This is what I found when I had this doubt.
mysql> create table numbers (a decimal(10,2), b float);
mysql> insert into numbers values (100, 100);
mysql> select @a := (a/3), @b := (b/3), @a * 3, @b * 3 from numbers \G
*************************** 1. row *************************...