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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
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#include "boost/multi_index/member.hpp"
#include "boost/multi_index/ordered_index.hpp"
using boost::multi_index_container;
using namespace boost::multi_index;
struct stu_num{}; // 索引-学号
struct stu_name{}; // 索引-姓名
struct stu_age{}; // 索引-年龄 ...
Why shouldn't Java enum literals be able to have generic type parameters?
... generic method like
public static MyEnum valueOf(String name);
in order to call it like MyEnum<String> myStringEnum = MyEnum.value("some string property"), that wouldn't work either.
For example what if you call MyEnum<Int> myIntEnum = MyEnum.<Int>value("some string proper...
C++ Structure Initialization
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@user1043000 well, for one, in this case the order in which you put your members is of upmost importance. If you add a field in the middle of your structure, you will have to go back to this code and look for the exact spot in which to insert your new initialization, wh...
PostgreSQL delete all content
...har(30),
constraint pk_customer primary key (customer_id)
);
create table orders (
order_id int not null,
number int not null,
customer_id int not null,
constraint pk_order primary key (order_id),
constraint fk_customer foreign key (customer_id) references customers(customer_id)
);
create table lo...
Breadth First Vs Depth First
... / / \
D E F
A depth first traversal would visit the nodes in this order
A, B, D, C, E, F
Notice that you go all the way down one leg before moving on.
A breadth first traversal would visit the node in this order
A, B, C, D, E, F
Here we work all the way across each level before going...
Best practice to run Linux service as a different user
..., the same is true for other Linux distros which use the init scripts in /etc/init.d .
8 Answers
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Why is it string.join(list) instead of list.join(string)?
...ng join on strins side-steps this problem at the cost of the "unintuitive" order. A better choice might have been to keep it a function with the first argument being the iterable and the second (optional one) being the joiner string - but that ship has sailed.
– user4815162342
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What does the C++ standard state the size of int, long type to be?
...luates to a number of bits high enough to contain required ranges, and
the ordering of type is still valid (e.g. sizeof(int) <= sizeof(long)).
Putting this all together, we are guaranteed that:
char, signed char, and unsigned char are at least 8 bits
signed short, unsigned short, signed int, an...
Why should a function have only one exit-point? [closed]
....
This became especially true when you needed to interject assignments in order to examine state (replaced with watch expressions in modern debuggers). It was also too easy to alter the control flow in ways that hid the problem or broke the execution altogether.
Single-exit methods were easier to ...
Sorting object property by values
...nce you have the array, you could rebuild the object from the array in the order you like, thus achieving exactly what you set out to do. That would work in all the browsers I know of, but it would be dependent on an implementation quirk, and could break at any time. You should never make assumption...