Programming development step by step ahead
Top new questions this week: |
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Union of 2 sets does not contain all itemsHow come when I change the order of the two sets in the unions below, I get different results? set1 = {1, 2, 3} set2 = {True, False} print(set1 | set2) # {False, 1, 2, 3} print(set2 | set1) …
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Is struct packing deterministic?For example, say I have two equivalent structs a and b in different projects: typedef struct _a { int a; double b; char c; } a; typedef struct _b { int d; double e; char f; } …
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Why does the compiler not give an ambiguous reference error?With reference to the following code #include <iostream> #include <tuple> #include <string> #include <type_traits> using std::cout; using std::endl; using std::string; …
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Is this-> mandatory to access Base<T> identifiers from derived classes?This code compiles with MSVC 2015, but doesn’t compile with Clang 5.0.0 (trunk 304874): template <typename T> struct Base { T data; }; template <typename T> struct Derived : …
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Why is declaration order important for passing a member function pointer as a template argument?Look at this code: template <typename T, void (T::*pfn)()> struct Testee {}; class Tester { private: void foo() {} public: using type_t = Testee<Tester, &Tester::foo>; }; …
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Overload resolution for multiply inherited operator()First, consider this C++ code: #include <stdio.h> struct foo_int { void print(int x) { printf(“int %d\n”, x); } }; struct foo_str { void print(const char* x) { …
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Is there a way to list the attributes of a class without instantiating an object?In Python 3.5, say I have: class Foo: def __init__(self, bar, barbar): self.bar = bar self.barbar = barbar I want to get the list [“bar”, “barbar”] from the class. I know I can …
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Greatest hits from previous weeks: |
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Is Java “pass-by-reference” or “pass-by-value”?I always thought Java was pass-by-reference; however I’ve seen a couple of blog posts (For example, this blog) that claim it’s not. I don’t think I understand the distinction they’re making. What is …
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Validate email address in JavaScript?How can an email address be validated in JavaScript?
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Can you answer these? |
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angular-pickadate timezone – selectedDate is one day before from modal date for other timezonesangular-pickadate works for my local time. To check global Times, I have changed my time zone to “America/Denver”. Now selected date is taken one day before today’s date (passed modal date), so it …
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Cross-referencing not working in rmarkdown beamer presentationI would like to link section headers in a beamer_presentation via Rmarkdown (ie., creating cross-references or Pandoc’s internal links). For example, I would like to have a link such as “see …
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Serializing to a byte array threw an IOException (should never happen)I have this new error from one user. This happened when I pushed the app with the new 11.0.0 Play |