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Catch passes an RNG which accepts int to random_shuffle. Inside random_shuffle, the STL tries to call that RNG with the difference_type of the user provided iterators. For std::vector, this is ptrdiff_t, which on amd64 builds is wider than int. This triggers a narrowing warning because the 64 bit difference is being truncated to 32 bits. Note that this RNG implementation still does not produce a correctly uniformly shuffled result -- it's currently asserting that std::rand can produce 1000000 which is false -- but I don't know enough about how much repeatable shuffles are necessary here, so I'm leaving that alone for now.
v1.5.7
Build status (on Travis CI) 
The latest, single header, version can be downloaded directly using this link
What's the Catch?
Catch stands for C++ Automated Test Cases in Headers and is a multi-paradigm automated test framework for C++ and Objective-C (and, maybe, C). It is implemented entirely in a set of header files, but is packaged up as a single header for extra convenience.
How to use it
This documentation comprises these three parts:
- Why do we need yet another C++ Test Framework?
- Tutorial - getting started
- Reference section - all the details
More
- Issues and bugs can be raised on the Issue tracker on GitHub
- For discussion or questions please use the dedicated Google Groups forum