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NULL vs nullptr (Why was it replaced?) [duplicate]
I know that in C++ 0x or NULL was replaced by nullptr in pointer-based applications. I'm just curious of the exact reason why they made this replacement?
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C++ map access discards qualifiers (const)
...an std::pair containing both the key (.first) and the value (.second).
In C++11, you could also use at() for std::map. If element doesn't exist the function throws a std::out_of_range exception, in contrast to operator [].
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bool to int conversion
...Standard conformant. bool to int conversion is implicit!
§4.7/4 from the C++ Standard says (Integral Conversion)
If the source type is bool, the value false is converted to zero and
the value true is converted to one.
As for C, as far as I know there is no bool in C. (before 1999) So boo...
Why does the C++ map type argument require an empty constructor when using []?
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Excellent answer -- note also emplace in C++11 as a terse alternative to insert.
– prideout
Nov 18 '14 at 19:32
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Why the switch statement cannot be applied on strings?
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The reason why has to do with the type system. C/C++ doesn't really support strings as a type. It does support the idea of a constant char array but it doesn't really fully understand the notion of a string.
In order to generate the code for a switch statement the compi...
What are the GCC default include directories?
...he output of the following commands:
For C:
gcc -xc -E -v -
For C++:
gcc -xc++ -E -v -
The credit goes to Qt Creator team.
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What is the performance cost of having a virtual method in a C++ class?
Having at least one virtual method in a C++ class (or any of its parent classes) means that the class will have a virtual table, and every instance will have a virtual pointer.
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Exporting functions from a DLL with dllexport
I'd like a simple example of exporting a function from a C++ Windows DLL.
4 Answers
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C/C++ include header file order
...re this is to include your headers before any other headers.
"Thinking in C++" in particular mentions this, referencing Lakos' "Large Scale C++ Software Design":
Latent usage errors can be avoided by ensuring that the .h file of a component parses by itself – without externally-provided declarat...
What is wrong with using goto? [duplicate]
...go):
What is actually wrong with it? Why are goto's even possible in C++ then?
6 Answers
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