大约有 38,000 项符合查询结果（耗时：0.0316秒） [XML]
Why can't (or doesn't) the compiler optimize a predictable addition loop into a multiplication?
...l compilers are brave enough to do that. It often draws a lot of criticism from the "C is just a higher-level assembly language" crowd. (Remember what happened when GCC introduced optimizations based on strict-aliasing semantics?)
Historically, GCC has shown itself as a compiler that has what it ta...
How to get file creation & modification date/times in Python?
...nel offers no way of accessing them; in particular, the structs it returns from stat() calls in C, as of the latest kernel version, don't contain any creation date fields. You can also see that the identifier st_crtime doesn't currently feature anywhere in the Python source. At least if you're on ex...
Create RegExps on the fly using string variables
... have to convert the string into a global (/.../g) RegExp. You can do this from a string using the new RegExp constructor:
new RegExp(string_to_replace, 'g')
The problem with this is that any regex-special characters in the string literal will behave in their special ways instead of being normal ...
How do I write a short literal in C++?
...the writers of the C99 standard got caught out by this. This is a snippet from Danny Smith's public domain stdint.h implementation:
/* 7.18.4.1 Macros for minimum-width integer constants
Accoding to Douglas Gwyn <gwyn@arl.mil>:
"This spec was changed in ISO/IEC 9899:1999 TC1; in IS...
JavaScript regex multiline flag doesn't work
I wrote a regex to fetch string from HTML, but it seems the multiline flag doesn't work.
5 Answers
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Can an enum class be converted to the underlying type?
...ic_cast. I use the following helper functions in my code to convert to and from an enum type and its underlying class.
template<typename EnumType>
constexpr inline decltype(auto) getIntegralEnumValue(EnumType enumValue)
{
static_assert(std::is_enum<EnumType>::value,"...
Convert Go map to json
...at's wrong, but you ignored it because you didn't check the error returned from json.Marshal.
json: unsupported type: map[int]main.Foo
JSON spec doesn't support anything except strings for object keys, while javascript won't be fussy about it, it's still illegal.
You have two options:
1 Use map[...
Where to define custom error types in Ruby and/or Rails?
...you might have to also include the exception file. See this example, again from httparty: github.com/jnunemaker/httparty/blob/…
– Jason Swett
Apr 15 '14 at 20:05
37
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Angularjs $q.all
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@Zerkotin you can throw from a .then in order to both handle it later and expose it to $exceptionHandler, which should save you that trouble and a global.
– Benjamin Gruenbaum
Aug 7 '14 at 6:16
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Getting root permissions on a file inside of vi? [closed]
...g a command. It should be omitted in scripts.
sil[ent] suppresses output from the command. In this case, we want to stop the Press any key to continue-like prompt that appears after running the :! command.
exec[ute] executes a string as a command. We can't just run :write because it won't proce...