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-rw-r--r-- | ml/dlib/examples/std_allocator_ex.cpp | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/ml/dlib/examples/std_allocator_ex.cpp b/ml/dlib/examples/std_allocator_ex.cpp new file mode 100644 index 000000000..0dc583fa0 --- /dev/null +++ b/ml/dlib/examples/std_allocator_ex.cpp @@ -0,0 +1,57 @@ +// The contents of this file are in the public domain. See LICENSE_FOR_EXAMPLE_PROGRAMS.txt +/* + This is an example illustrating the use of the dlib::std_allocator object. + + In this example we will create the necessary typedefs to give the + dlib::std_allocator object to the standard string and vector objects + in the STL. Thus we will create versions of std::string and std::vector + that perform all their memory allocations and deallocations via one of + the dlib memory manager objects. +*/ + + +// include everything we need for this example +#include <vector> +#include <iostream> +#include <string> +#include <dlib/std_allocator.h> +#include <dlib/memory_manager.h> +#include <dlib/memory_manager_stateless.h> + +using namespace std; +using namespace dlib; + + +int main() +{ + // Make a typedef for an allocator that uses the thread safe memory_manager_stateless object with a + // global memory pool. This version of the memory_manager_stateless object keeps everything it allocates + // in a global memory pool and doesn't release any memory until the program terminates. + typedef std_allocator<char, memory_manager_stateless<char>::kernel_2_3a> alloc_char_with_global_memory_pool; + + // Now make a typedef for a C++ standard string that uses our new allocator type + typedef std::basic_string<char, char_traits<char>, alloc_char_with_global_memory_pool > dstring; + + + // typedef another allocator for dstring objects + typedef std_allocator<dstring, memory_manager_stateless<char>::kernel_2_3a> alloc_dstring_with_global_memory_pool; + + // Now make a typedef for a C++ standard vector that uses our new allocator type and also contains the new dstring + typedef std::vector<dstring, alloc_dstring_with_global_memory_pool > dvector; + + // Now we can use the string and vector we have as we normally would. So for example, I can make a + // dvector and add 4 strings into it like so: + dvector v; + v.push_back("one"); + v.push_back("two"); + v.push_back("three"); + v.push_back("four"); + + // And now we print out the contents of our vector + for (unsigned long i = 0; i < v.size(); ++i) + { + cout << v[i] << endl; + } + +} + |