Daß das was du da treibst ziemlich grausig ist, ist dir schon klar, gell?
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C-/C++-Quelltext
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#include <cassert>
#include <cstddef>
#include <limits>
#include <vector>
#include <fstream>
#include <iostream>
struct sample_t {
float fTmpH;
float fTmpU;
float fTmpBx;
};
std::istream & operator>>( std::istream & is, sample_t & sample )
{
char const separator{ '/' };
char separators[2];
sample_t temp{};
if( !( is >> temp.fTmpH >> separators[ 0 ] >> temp.fTmpU >> separators[ 1 ] >> temp.fTmpBx ) ||
separators[ 0 ] != separator || separators[ 1 ] != separator ) {
is.setstate( std::ios::failbit );
return is;
}
sample = temp;
return is;
}
std::ostream & operator<<( std::ostream & os, sample_t const & sample )
{
char const separator{ '/' };
os << sample.fTmpH << separator << sample.fTmpU << separator << sample.fTmpBx << '\n';
return os;
}
std::vector< sample_t > read_samples( std::istream & is, std::size_t num_samples, std::size_t sample_density = 1 ) throw( ... )
{
assert( is && num_samples && sample_density );
std::size_t sample_delta{ num_samples / sample_density };
sample_t sample;
std::vector< sample_t > samples;
for( std::size_t i{ 1 }; i < num_samples; ++i ) {
if( i % sample_delta ) {
is.ignore( std::numeric_limits< std::streamsize >::max(), '\n' );
continue;
}
if( !( is >> sample ) )
throw std::runtime_error{ "File format error!" };
is.ignore( std::numeric_limits< std::streamsize >::max(), '\n' );
samples.push_back( sample );
}
return std::move( samples );
}
int main()
{
std::ofstream output{ "data.txt" };
sample_t sample;
for( std::size_t i{ 1 }; i <= 10000; ++i ) {
sample.fTmpH = i + 0.1f;
sample.fTmpU = i + 0.2f;
sample.fTmpBx = i + 0.3f;
output << sample;
}
output.close();
std::ifstream input{ "data.txt" };
auto samples = read_samples( input, 10000, 100 );
for( auto & i : samples )
std::cout << i;
}
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Dieser Beitrag wurde bereits 1 mal editiert, zuletzt von »Swordfish« (01.02.2015, 23:09)