96 lines
2.6 KiB
Markdown
96 lines
2.6 KiB
Markdown
# nestlog -- logging with automatic indenting according to call graph
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Nestlog is a lightweight header-only library for console logging.
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## Examples
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### 1
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/* examples/ex1/ex1.cpp */
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#include "nestlog/scope.hpp"
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void A(int x) {
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XO_SCOPE(log); // i.e. xo::scope log("A");
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log("enter ", ":x ", x);
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}
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int
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main(int argc, char ** argv) {
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A(66);
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}
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output:
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+A
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enter :x 66
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-A
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### 2
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/* examples ex2/ex2.cpp */
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#include "nestlog/scope.hpp"
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using namespace xo;
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int
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fib(int n) {
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scope log(XO_ENTER0(info), ":n ", n);
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int retval = 1;
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if (n >= 2) {
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retval = fib(n - 1) + fib(n - 2);
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log && log(":n ", n);
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}
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log.end_scope("<- :retval ", retval);
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return retval;
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}
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int
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main(int argc, char ** argv) {
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log_config::min_log_level = xo::log_level::info;
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log_config::indent_width = 4;
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int n = 4;
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scope log(XO_ENTER0(info), ":n ", 4);
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int fn = fib(n);
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log && log(":n ", n);
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log && log("<- :fib(n) ", fn);
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}
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output:
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20:13:12.992909 +(0) main :n 4 [ex2.cpp:30]
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20:13:12.992968 +(1) fib :n 4 [ex2.cpp:9]
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20:13:12.992986 +(2) fib :n 3 [ex2.cpp:9]
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20:13:12.992999 +(3) fib :n 2 [ex2.cpp:9]
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20:13:12.993002 +(4) fib :n 1 [ex2.cpp:9]
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20:13:12.993012 -(4) fib <- :retval 1
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20:13:12.993022 +(4) fib :n 0 [ex2.cpp:9]
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20:13:12.993032 -(4) fib <- :retval 1
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:n 2
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20:13:12.993049 -(3) fib <- :retval 2
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20:13:12.993059 +(3) fib :n 1 [ex2.cpp:9]
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20:13:12.993069 -(3) fib <- :retval 1
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:n 3
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20:13:12.993085 -(2) fib <- :retval 3
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20:13:12.993095 +(2) fib :n 2 [ex2.cpp:9]
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20:13:12.993105 +(3) fib :n 1 [ex2.cpp:9]
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20:13:12.993115 -(3) fib <- :retval 1
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20:13:12.993124 +(3) fib :n 0 [ex2.cpp:9]
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20:13:12.993134 -(3) fib <- :retval 1
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:n 2
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20:13:12.993145 -(2) fib <- :retval 2
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:n 4
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20:13:12.993155 -(1) fib <- :retval 5
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:n 4
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<- :fib(n) 5
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20:13:12.993172 -(0) main
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