vtk::literals Namespace Reference

Functions
constexpr VTKCOMMONCORE_EXPORT vtkStringToken::Hash	operator""_hash (const char *data, std::size_t size)
	Construct the hash of a string literal, like so: More...
constexpr VTKCOMMONCORE_EXPORT vtkStringToken	operator""_token (const char *data, std::size_t size)
	Construct a token from a string literal, like so: More...

Function Documentation

operator""_hash()

constexpr VTKCOMMONCORE_EXPORT vtkStringToken::Hash vtk::literals::operator""_hash ( const char *  data, std::size_t  size  )

inlineconstexpr

Construct the hash of a string literal, like so:

 {c++}
using namespace vtk::literals;
vtkStringToken::Hash t = "test"_hash;
bool ok = false;
switch (t)
{
  case "foo"_hash: ok = false;
  case "test"_hash: ok = true;
}
std::cout << t << "\n"; // Prints a hash-code.
std::cout << ok << "\n"; // Prints a true value.

As the example above shows, it is possible to use hashed strings in switch statements since the hashing occurs at build time. This is more efficient than a sequence of if-conditionals performing string comparisons.

Definition at line 160 of file vtkStringToken.h.

operator""_token()

constexpr VTKCOMMONCORE_EXPORT vtkStringToken vtk::literals::operator""_token ( const char *  data, std::size_t  size  )

inlineconstexpr

Construct a token from a string literal, like so:

 {c++}
using namespace vtk::literals;
vtkStringToken t = "test"_token;
std::cout << t.id() << "\n"; // Prints a hash-code.
// std::cout << t.value() << "\n"; // Prints "test" if someone else constructed the token from a
ctor; else throws exception.

Definition at line 180 of file vtkStringToken.h.