c++ - What is the logic behind this formatting of the lambda by clang-format? -

i using clang-format (version 3.5) emacs (version 24.5.2). here simple piece of code formatted clang-format in llvm style:

int main() {     std::cout << "> ";     std::string word;     while (std::cin >> word) {         std::cout << std::accumulate(word.cbegin(), word.cend(), 0,                                      [](int cur, char ch) {                          return cur + (ch - '0');                      }) << std::endl << "> ";     }     return 0; } 

note how aligned body , closing brace of lambda. there logic formatting or it's lack of support lambdas? there configuration parameters of clang-format need set better formatting?

std::accumulate(word.cbegin(), word.cend(), 0, [](int cur, char ch) { return cur + (ch - '0'); })

here have long function call. clean up, take long argument, , split onto own line:

std::accumulate(word.cbegin(), word.cend(), 0, [](int cur, char ch) { return cur + (ch - '0'); }) 

when this, indent argument line (:

std::accumulate(word.cbegin(), word.cend(), 0,                 [](int cur, char ch) { return cur + (ch - '0'); }) 

so far good. have open {. well, means new line

std::accumulate(word.cbegin(), word.cend(), 0,                 [](int cur, char ch) { return cur + (ch - '0'); }) 

with indent. base of indent? well, start of std::accumulate. add 4 spaces:

std::accumulate(word.cbegin(), word.cend(), 0,                 [](int cur, char ch) {     return cur + (ch - '0'); }) 

then hit }. new line, backdent:

std::accumulate(word.cbegin(), word.cend(), 0,                 [](int cur, char ch) {     return cur + (ch - '0'); }) 

finally, embed in middle of larger expression, , mess had above.

the above purely reasonable story, , not based off expertise of clang-format. cannot tell how make better.