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author | Laurent Pinchart <laurent.pinchart@ideasonboard.com> | 2021-04-23 02:01:51 +0300 |
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committer | Laurent Pinchart <laurent.pinchart@ideasonboard.com> | 2021-05-18 14:45:28 +0300 |
commit | ad38d9151b87ccd7628d09e0a9668539117a4f8b (patch) | |
tree | ca2d9aaa28d14fd7215fcd58b121051c69e129be /src/qcam/main_window.cpp | |
parent | d832e9622e69f88986c2b5a3ea836238b860e0f7 (diff) |
libcamera: utils: Add enumerate view for range-based for loops
Range-based for loops are handy and widely preferred in C++, but are
limited in their ability to replace for loops that require access to a
loop counter. The enumerate() function solves this problem by wrapping
the iterable in an adapter that, when used as a range-expression, will
provide iterators whose value_type is a pair of index and value
reference.
The iterable must support std::begin() and std::end(). This includes all
containers provided by the standard C++ library, as well as C-style
arrays.
A typical usage pattern would use structured binding to store the index
and value in two separate variables:
std::vector<int> values = ...;
for (auto [index, value] : utils::enumerate(values)) {
...
}
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Diffstat (limited to 'src/qcam/main_window.cpp')
0 files changed, 0 insertions, 0 deletions