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Update example

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This commit is contained in:
mandreyel 2018-03-02 12:28:23 +01:00
parent 7bb887e88c
commit 742469621a
2 changed files with 9 additions and 10 deletions
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11
README.md
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@ -58,6 +58,7 @@ However, mio does not check whether the provided file descriptor has the same ac
#include <system_error> // for std::error_code #include <system_error> // for std::error_code
#include <cstdio> // for std::printf #include <cstdio> // for std::printf
#include <cassert> #include <cassert>
#include <algorithm>
int handle_error(const std::error_code& error) int handle_error(const std::error_code& error)
{ {
@ -73,16 +74,14 @@ int main()
std::error_code error; std::error_code error;
mio::mmap_sink rw_mmap = mio::make_mmap_sink( mio::mmap_sink rw_mmap = mio::make_mmap_sink(
"file.txt", 0, mio::map_entire_file, error); "file.txt", 0, mio::map_entire_file, error);
if(error) { return handle_error(error); } if (error) { return handle_error(error); }
assert(rw_mmap.is_open());
assert(!rw_mmap.empty());
// You can use any iterator based function. // You can use any iterator based function.
std::fill(rw_mmap.begin(), rw_mmap.end(), 0); std::fill(rw_mmap.begin(), rw_mmap.end(), 0);
// Or manually iterate through the mapped region just as if it were any other // Or manually iterate through the mapped region just as if it were any other
// container, and change each byte's value (since this is a read-write mapping). // container, and change each byte's value (since this is a read-write mapping).
for(auto& b : rw_mmap) { for (auto& b : rw_mmap) {
b += 10; b += 10;
} }
@ -93,7 +92,7 @@ int main()
// Don't forget to flush changes to disk, which is NOT done by the destructor for // Don't forget to flush changes to disk, which is NOT done by the destructor for
// more explicit control of this potentially expensive operation. // more explicit control of this potentially expensive operation.
rw_mmap.sync(error); rw_mmap.sync(error);
if(error) { handle_error(error); } if (error) { return handle_error(error); }
// We can then remove the mapping, after which rw_mmap will be in a default // We can then remove the mapping, after which rw_mmap will be in a default
// constructed state, i.e. this has the same effect as if the destructor had been // constructed state, i.e. this has the same effect as if the destructor had been
@ -103,7 +102,7 @@ int main()
// Now create the same mapping, but in read-only mode. // Now create the same mapping, but in read-only mode.
mio::mmap_source ro_mmap = mio::make_mmap_source( mio::mmap_source ro_mmap = mio::make_mmap_source(
"file.txt", 0, mio::map_entire_file, error); "file.txt", 0, mio::map_entire_file, error);
if(error) { return handle_error(error); } if (error) { return handle_error(error); }
const int the_answer_to_everything = ro_mmap[answer_index]; const int the_answer_to_everything = ro_mmap[answer_index];
assert(the_answer_to_everything == 42); assert(the_answer_to_everything == 42);

8
test/example.cpp
View File

@ -18,14 +18,14 @@ int main()
std::error_code error; std::error_code error;
mio::mmap_sink rw_mmap = mio::make_mmap_sink( mio::mmap_sink rw_mmap = mio::make_mmap_sink(
"file.txt", 0, mio::map_entire_file, error); "file.txt", 0, mio::map_entire_file, error);
if(error) { return handle_error(error); } if (error) { return handle_error(error); }
// You can use any iterator based function. // You can use any iterator based function.
std::fill(rw_mmap.begin(), rw_mmap.end(), 0); std::fill(rw_mmap.begin(), rw_mmap.end(), 0);
// Or manually iterate through the mapped region just as if it were any other // Or manually iterate through the mapped region just as if it were any other
// container, and change each byte's value (since this is a read-write mapping). // container, and change each byte's value (since this is a read-write mapping).
for(auto& b : rw_mmap) { for (auto& b : rw_mmap) {
b += 10; b += 10;
} }
@ -36,7 +36,7 @@ int main()
// Don't forget to flush changes to disk, which is NOT done by the destructor for // Don't forget to flush changes to disk, which is NOT done by the destructor for
// more explicit control of this potentially expensive operation. // more explicit control of this potentially expensive operation.
rw_mmap.sync(error); rw_mmap.sync(error);
if(error) { handle_error(error); } if (error) { return handle_error(error); }
// We can then remove the mapping, after which rw_mmap will be in a default // We can then remove the mapping, after which rw_mmap will be in a default
// constructed state, i.e. this has the same effect as if the destructor had been // constructed state, i.e. this has the same effect as if the destructor had been
@ -46,7 +46,7 @@ int main()
// Now create the same mapping, but in read-only mode. // Now create the same mapping, but in read-only mode.
mio::mmap_source ro_mmap = mio::make_mmap_source( mio::mmap_source ro_mmap = mio::make_mmap_source(
"file.txt", 0, mio::map_entire_file, error); "file.txt", 0, mio::map_entire_file, error);
if(error) { return handle_error(error); } if (error) { return handle_error(error); }
const int the_answer_to_everything = ro_mmap[answer_index]; const int the_answer_to_everything = ro_mmap[answer_index];
assert(the_answer_to_everything == 42); assert(the_answer_to_everything == 42);