Hello all, A few months ago, I probed for interest in a library for local functions with Boost.ScopeExit's variable binding. Based on that discussion, I have now implemented the Boost.Local library. I have uploaded the source files boost-local_0_1_0-818.zip in the Boost Vault under Function Objects: http://www.boostpro.com/vault/index.php?&direction=0&order=&directory=Function%20Objects The documentation on the web: http://contractpp.sourceforge.net/boost-local_0_1_0-818/libs/local/doc/html/... Any comment? As far as I can tell, Boost.Local is ready for a formal review so I am looking for a review manager. Any volunteer? Thanks, Lorenzo ________________________________________________ P.S. A preview from Boost.Local's documentation: The Boost Local library implements local functions, local blocks, and local exits for the C++ programming language. INTRODUCTION Local functions are a form of information hiding and are useful for dividing procedural tasks into subtasks which are only meaningful locally, avoiding cluttering other parts of the program with functions, variables, etc unrelated to those parts. Local functions therefore complement other structuring possibilities such as namespaces and classes. Local functions are a feature of many programming languages, notably Pascal and Ada, yet lacking from C++ (see also [N2511]). This library supports the following features for local functions (see the Alternatives section for a comparison between this library and features offered by C++ local class members, C++0x lambda functions, Boost.Lambda, Boost.Phoenix, and Boost.ScopeExit): * Local functions can access, or better bind, any of the variables from the enclosing scope. Furthermore, local functions defined within a member function can bind the enclosing object this. * The local function body is programmed using the usual C++ syntax. * Local functions can be passed as template parameters (so they can be conveniently passed to STL algorithms, etc). * However, local functions must be defined within a declarative context (e.g., at a point in the code where local variables can be declared) thus they cannot be defined within an expression. In addition to local functions, this library also supports the following features: * Local blocks which define blocks of code that bind variables from the enclosing scope. Local blocks allow programmers to bind variables as constants (constant binding) so to prevent local chunks of code from modifying selected variables. * Local exits which define blocks of code that are executed when the enclosing scope is exited (again with support for constant binding and binding of the object this). AN EXAMPLE The following example illustrates a simple use of this library and it starts introducing the library API (see the Tutorial section for more details on how to use this library): * A local function is passed to the STL std::for_each() algorithm to add together the values of an array. Variables in scope are bound to the local function by both constant value and non-constant reference. * A local exit is used to automatically release the array's memory at scope exit. * A local block is used to assert the correct final value of the summation in a constant-correct context (therefore preventing the assertion from mistakenly changing any of the variables in scope). #include <boost/local/function.hpp> #include <boost/local/block.hpp> #include <boost/local/exit.hpp> #include <algorithm> #include <iostream> #include <cassert> int main() { double sum = 0.0; int factor = 10; BOOST_LOCAL_FUNCTION( (void) (add)( (double)(num) (const bind)((factor)) (bind)((&sum)) ) ) { sum += factor * num; std::clog << "Summed: " << sum << std::endl; } BOOST_LOCAL_FUNCTION_END(add) add(100.0); size_t size = 2; double* nums = new double[size]; BOOST_LOCAL_EXIT( (const bind)((&size)) (bind)((nums)) ) { if (size && nums) delete[] nums; std::clog << "Freed array: " << nums << std::endl; } BOOST_LOCAL_EXIT_END nums[0] = 90.5; nums[1] = 7.0; std::for_each(nums, nums + size, add); BOOST_LOCAL_BLOCK( (const bind)((&sum)) ) { // So far: sum = 10 * 100.0 + 10 * 90.5 + 10 * 7.0 = 1975.0 assert(sum == 1975.0); std::clog << "Asserted summation: " << sum << std::endl; } BOOST_LOCAL_BLOCK_END return 0; }