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refs #583 as_const

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Mathew Sutcliffe
2016-02-02 18:01:36 +00:00
parent d6b9fe6f95
commit f9ee637a1e
1 changed files with 12 additions and 0 deletions
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12
src/blackmisc/range.h
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@@ -38,6 +38,18 @@ namespace BlackMisc
template <class> class CRange; template <class> class CRange;
/*!
* Own implementation of C++17 std::as_const. Adds const to any lvalue.
* Useful with non-mutating range-for loops to avoid unnecessary detachment of Qt implicitly shared containers.
* Does not allow rvalues, as that could easily lead to undefined behaviour.
*/
//! @{
template <class T>
Q_CONSTEXPR typename std::add_const<T>::type &as_const(T &v) Q_DECL_NOEXCEPT { return v; }
template <class T>
void as_const(const T &&) = delete;
//! @}
/*! /*!
* Any container class with begin and end iterators can inherit from this CRTP class * Any container class with begin and end iterators can inherit from this CRTP class
* to gain some useful algorithms as member functions. * to gain some useful algorithms as member functions.