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Tag Archives: l-value
Getting your head around auto’s type-deduction rules
Technical Consultant at Feabhas Ltd
Glennan is an embedded systems and software engineer with over 20 years experience, mostly in high-integrity systems for the defence and aerospace industry.
He specialises in C++, UML, software modelling, Systems Engineering and process development.
He specialises in C++, UML, software modelling, Systems Engineering and process development.
Latest posts by Glennan Carnie (see all)
- Practice makes perfect, part 3 – Idiomatic kata - February 27, 2020
- Practice makes perfect, part 2– foundation kata - February 13, 2020
- Practice makes perfect, part 1 – Code kata - January 30, 2020
Automatic type-deduction is perhaps one of the more divisive features of Modern C++. At its core it’s a straightforward concept: let the compiler deduce the type of an object from its initialiser. Used in the right way this can improve the readability and maintainability of your code.
However, because auto is based on template type-deduction rules there are some subtleties that can catch the unwary programmer.
In this article we’ll have a look at auto in the context of the template type-deduction […]
Posted in C/C++ Programming
Tagged auto, C++, C++0x, C++11, C++1y, l-value, l-value references, r-value, r-value references, reference collapsing, type deduction
3 Comments
The Rule of the Big Five
Technical Consultant at Feabhas Ltd
Glennan is an embedded systems and software engineer with over 20 years experience, mostly in high-integrity systems for the defence and aerospace industry.
He specialises in C++, UML, software modelling, Systems Engineering and process development.
He specialises in C++, UML, software modelling, Systems Engineering and process development.
Latest posts by Glennan Carnie (see all)
- Practice makes perfect, part 3 – Idiomatic kata - February 27, 2020
- Practice makes perfect, part 2– foundation kata - February 13, 2020
- Practice makes perfect, part 1 – Code kata - January 30, 2020
The dynamic creation and destruction of objects was always one of the bugbears of C. It requires the programmer to manually control the allocation, initialisation and deallocation of memory for the object. Because many C programmers weren’t educated in the potential problems (or were just plain lazy or delinquent in their programming) C got a reputation in some quarters for being an unsafe, memory-leaking language.
C++ improved matters significantly with an idiom known as RAII/RRID; more generically referred to as resource […]
L-values, r-values, expressions and types
Technical Consultant at Feabhas Ltd
Glennan is an embedded systems and software engineer with over 20 years experience, mostly in high-integrity systems for the defence and aerospace industry.
He specialises in C++, UML, software modelling, Systems Engineering and process development.
He specialises in C++, UML, software modelling, Systems Engineering and process development.
Latest posts by Glennan Carnie (see all)
- Practice makes perfect, part 3 – Idiomatic kata - February 27, 2020
- Practice makes perfect, part 2– foundation kata - February 13, 2020
- Practice makes perfect, part 1 – Code kata - January 30, 2020
Simple question: Why does this code compile?
…and this code doesn’t?
The compiler gives the following:
L-values
What is this ‘l-value’ thing? When (most of us) were taught C we were told an l-value is a value that can be placed on the left-hand-side of an assignment expression. However, that doesn’t give much of a clue as to what might constitute an l-value; so most of the time we resort to guessing and trial-and-error.
Basically, an l-value is a named object; which may be modifiable […]