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What is Prefix.pch file in Xcode?
...ngs (Command-Option-E, build tab) and uncheck Precompile Prefix Header (GCC_PRECOMPILE_PREFIX_HEADER). You can also remove the value of the Prefix Header setting if you wish.
Also note that,
Don't put macros in a.pch file! A .pch file is, by definition, a project specific precompiled header. It re...
boost多索引容器multi_index_container实战 - C/C++ - 清泛网 - 专注C/C++及内核技术
boost多索引容器multi_index_container实战boost多索引容器multi_index_container用法详解、性能测试等。目录：
boost多索引容器multi_index_container详解
boost多索引容器multi_index_container架构图
boost多索引容器multi_index_container性能测试
原文地...
Right way to initialize an OrderedDict using its constructor such that it retains order of initial d
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See __hash__. Specifically about the str type.
– metatoaster
Aug 25 '14 at 6:43
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Cost of len() function
...s, not C terms]: look up "len" in a dictionary and dispatch it to the built_in len function which will look up the object's __len__ method and call that ... all it has to do is return self.length
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Deleting all records in a database table
...ow do I delete all records in one of my database tables in a Ruby on Rails app?
7 Answers
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How can I see normal print output created during pytest run?
...l help: docs.pytest.org/en/latest/capture.html
– code_dredd
Aug 22 '19 at 19:19
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Unknown column in 'field list' error on MySQL Update query
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While working on a .Net app build with EF code first, I got this error message when trying to apply my migration where I had a Sql("UPDATE tableName SET columnName = value"); statement.
Turns out I misspelled the columnName.
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List of installed gems?
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Gem::Specification.map {|a| a.name}
However, if your app uses Bundler it will return only list of dependent local gems. To get all installed:
def all_installed_gems
Gem::Specification.all = nil
all = Gem::Specification.map{|a| a.name}
Gem::Specification.reset
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How to convert a string or integer to binary in Ruby?
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You have Integer#to_s(base) and String#to_i(base) available to you.
Integer#to_s(base) converts a decimal number to a string representing the number in the base specified:
9.to_s(2) #=> "1001"
while the reverse is obtained with String#to...
Can't access object property, even though it shows up in a console log
...cess, but on the very next line of code, I can't access it with config.col_id_3 (see the "undefined" in the screenshot?). Can anyone explain this? I can get access to every other property except field_id_4 as well.
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