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__attribute__ - C/C++ - 清泛网 - 专注C/C++及内核技术

...nocommon,deprecated,mode,section,shared, tls_model,transparent_union,unused,vector_size,weak,dllimport,dlexport等, 详细信息可参考: http://gcc.gnu.org/onlinedocs/gcc-4.0.0/gcc/Variable-Attributes.html#Variable-Attributes 类型属性(Type Attribute) 关键...
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How do I print a double value with full precision using cout?

...int out the binary bits (or hex nybbles). One way of doing that is using a union to type-pun the double to a integer and then printing the integer, since integers do not suffer from truncation or round-off issues. (Type punning like this is not supported by the C++ standard, but it is supported in C...
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Illegal mix of collations (utf8_unicode_ci,IMPLICIT) and (utf8_general_ci,IMPLICIT) for operation '=

Error message on MySql: 7 Answers 7 ...
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phpmyadmin logs out after 1440 secs

In my local development Ubuntu box I use MySQL and phpmyadmin to work with the database. 24 Answers ...
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SQL RANK() versus ROW_NUMBER()

...rows are tied when ordered by ID) WITH T(StyleID, ID) AS (SELECT 1,1 UNION ALL SELECT 1,1 UNION ALL SELECT 1,1 UNION ALL SELECT 1,2) SELECT *, RANK() OVER(PARTITION BY StyleID ORDER BY ID) AS 'RANK', ROW_NUMBER() OVER(PARTITION BY StyleID ORDER BY...
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Kill a postgresql session/connection

...g the database. def drop_database(config) case config['adapter'] when /mysql/ ActiveRecord::Base.establish_connection(config) ActiveRecord::Base.connection.drop_database config['database'] when /sqlite/ require 'pathname' path = Pathname.new(config['database']) file = path....
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Interface type check with Typescript

...mentioned: since TypeScript 2.0, you can even take the advantage of tagged union type. interface Foo { type: 'foo'; fooProperty: string; } interface Bar { type: 'bar'; barProperty: number; } let object: Foo | Bar; // You will see errors if `strictNullChecks` is enabled. if (objec...
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How do I modify fields inside the new PostgreSQL JSON datatype?

...FROM json_each("json") WHERE "key" <> "key_to_set" UNION ALL SELECT "key_to_set", to_json("value_to_set")) AS "fields" $function$; SQLFiddle Edit: A version, which sets multiple keys & values: CREATE OR REPLACE FUNCTION "json_object_set_keys"( "json" j...
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how to exclude null values in array_agg like in string_agg using postgres?

...array[null]: select array_agg(x)-array[''] from ( select 'Y' x union all select null union all select 'N' union all select '' ) x; That's all: {Y, N} share | ...
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What is the fastest or most elegant way to compute a set difference using Javascript arrays?

... Why JavaScript sets don't have union/intersect/difference built in is beyond me... – SwiftsNamesake Nov 27 '16 at 4:50 6 ...