Category: Uncategorized
-
Making HTTP REST Request in C++
Introduction Today, I am going to show you on how to make HTTP request to a REST server using C++ Requests library by Huu Nguyen. Mr Nguyen is heavily influenced by Python Requests design philosoply when writing C++ Requests. Those who had used or familiar with Python Requests, should feel right at home with C++ […]
-
C++11: Compile-time Conditional Types
Introduction C++11 introduces std::conditional to give C++ developer the flexibility to choose a type based on the compile-time condition. If the boolean parameter of the std::conditional is true, then the delved type is class T or else it is class F. Below is an example on how to use std::conditional. Before to use std::conditional, we […]
-
Use STL copy, Not memcpy to Copy Array
Many C++ developers like to use memcpy() to copy POD arrays to extract the maximum performance during the copy. See the POD structure below. What if a new unsuspecting developer adds a string member and is not aware that the code uses memcpy() to do copying? memcpy() only makes shallow copies. The code no longer […]
-
Erase-remove Idiom Revisited
Recently, I reread Erase-remove Idiom on classic Effective STL by Scott Meyers, which is dated by now, so I also consulted the same topic on another STL book published in 2017. How to remove elements from container is a common C++ interview question, so you may want to sit up and pay attention here. std::vector […]
-
C++ Summing For Loop Benchmark
Introduction The initial motivation is to find out the overhead of different for-loop types in C++. Code Copy and paste below code into Godbolt Online C++ Compiler to see the generated assembly code. Note: The array or vector are initialized in the benchmark. The simplified code below is for you to copy and paste […]
-
C++ Tip: Modification Inside const Function
Introduction There are times where modification inside const member function must be done (for example, to allow for caching or memoization). The mutable keyword and const_cast are well-known in the C++ circles to work around these. The 3rd way is to use a const pointer; we cannot modify the const pointer but we can […]
-
C++ Tip: Make Your Class Non-Copyable Without Boost
Introduction There are times where an object should never be passed by copy but by reference or pointer. For instance, the class has a data member (like counter or mutex) which should not be duplicated. In this tip, we take a look at 2 techniques which declare the class to be non-copyable without resorting to using […]
Coding Tidbit 