Mirror of https://github.com/leanprover/lean2 in case it ever disappears
f97c260b0b
The environment object is a "smart-pointer".
Before this commit, the use of "const &" for environment objects was broken.
For example, suppose we have a function f that should not modify the input environment.
Before this commit, its signature would be
void f(environment const & env)
This is broken, f's implementation can easilty convert it to a read-write pointer by using
the copy constructor.
environment rw_env(env);
Now, f can use rw_env to update env.
To fix this issue, we now have ro_environment. It is a shared *const* pointer.
We can convert an environment into a ro_environment, but not the other way around.
ro_environment can also be seen as a form of documentation.
For example, now it is clear that type_inferer is not updating the environment, since its constructor takes a ro_environment.
Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>
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| LICENSE | ||
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About
Requirements
- C++11 compatible compiler: g++ (version >= 4.8.1), or clang++ (version >= 3.3)
- CMake
- GMP (GNU multiprecision library)
- MPFR (GNU MPFR Library)
- Lua 5.2 or 5.1, or LuaJIT 2.0
- (optional) gperftools
- (optional) Boost (version >= 1.54), we can build Lean using boost::thread instead of std::thread. When using Boost, Lean can modify the thread stack size.
Installing required packages at
Build Instructions
Miscellaneous
- Testing and Code Coverage
- Building Doxygen Documentation:
doxygen src/Doxyfile - Coding style
- Git Commit Convention
- Automatic builds