library/cpp/lwtrace/example3/lwtrace_example3.cpp


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#include <library/cpp/lwtrace/all.h>
#include <google/protobuf/text_format.h>
#include "my_action.h"
 
#define LWTRACE_EXAMPLE_PROVIDER(PROBE, EVENT, GROUPS, TYPES, NAMES)          \
    PROBE(IterationProbe, GROUPS(), TYPES(i32, double), NAMES("n", "result")) \ 
    /**/ 
 
LWTRACE_DECLARE_PROVIDER(LWTRACE_EXAMPLE_PROVIDER) 
LWTRACE_DEFINE_PROVIDER(LWTRACE_EXAMPLE_PROVIDER) 
 
void InitLWTrace() { 
    NLWTrace::StartLwtraceFromEnv([=](NLWTrace::TManager& mngr) {
        mngr.RegisterCustomAction<TMyActionExecutor>();
    });
} 
 
long double Fact(int n) {
    if (n < 0) { 
        ythrow yexception() << "N! is undefined for negative N (" << n << ")"; 
    } 
    double result = 1; 
    for (; n > 1; --n) { 
        GLOBAL_LWPROBE(LWTRACE_EXAMPLE_PROVIDER, IterationProbe, n, result); 
        result *= n; 
    } 
    return result; 
} 
 
void FactorialCalculator() { 
    i32 n; 
    Cout << "Enter a number: "; 
    TString str;
    Cin >> n; 
    double factN = Fact(n); 
    Cout << n << "! = " << factN << Endl << Endl; 
} 
 
int main() { 
    InitLWTrace(); 
    FactorialCalculator(); 
    return 0; 
}