temporary-objects

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scala speed when using get() method on hash tables? (are temporary Option() objects generated?)

I am converting some code to Scala.It\'s code that sits in an inner loop with very large amounts of data so it needs to be fast, and it involves looking up keys in a hash table and computing probabili[详细]

2023-04-12 04:36 分类：问答
Temporaries lifetime in N3290 C++ draft

A point from N3290 C++ draft, § 12.2, 5th point, line 10. The second context is when a reference is bound to a temporary. The[详细]

2023-04-04 01:04 分类：问答
Lifetime of temporary objects in SWIG's Python wrappers (?)

Edited 12 Feb I\'ve just recently come up with an odd crash using some SWIG-generated Python wrappers for some C++ classes.It seems that the combination of SWIG and Python together are somewhat eager[详细]

2023-02-10 05:36 分类：问答
What is stack-based reference?

What is stack-based references? How are they different from references that are members of objects? Does the Standard talk about these?[详细]

2023-02-06 05:23 分类：问答
In an STL Map of structs, why does the "[ ]" operator cause the struct's dtor to be invoked 2 extra times?

I\'ve created a simple test case exhibiting a strange behavior I\'ve noticed in a larger code base I\'m working on. This test case is below. I\'m relying on the STL Map\'s \"[ ]\" operator to create a[详细]

2023-01-21 03:32 分类：问答
sqlite: temporary table/view in a read-only db?

It seems that sqlite won\'t allow me to create a temporary view in a read-only db. Am I missing something? If it\'s TEMPORARY, I figured db connection mode shouldn\'t matter.[详细]

2023-01-10 08:35 分类：问答
Why is T() = T() allowed?

I believe the expression T() creates an rvalue (by the Standard).However, the following code compiles (at least on gcc4.0):[详细]

2023-01-01 03:18 分类：问答
Why do C++ allow constant to be transformed to reference argument in another method?

void outputString(const string &ss) { cout << \"outputString(const string& ) \" + ss << endl;[详细]

2022-12-14 23:17 分类：问答