Iterator and Algorithm Patterns

All Any Checks

std::all_of and std::any_of summarize whether every value or at least one value satisfies a predicate.

all_of `std::all_of` is true only when every element satisfies the predicate.
any_of `std::any_of` is true when at least one element satisfies the predicate.

All Any Checks

threshold
all_any_checks.cpp
Replay: real traced execution (multi-file project)
#include <algorithm>
#include <iostream>
#include <vector>

int main() {
    std::vector<int> scores{72, 85, 91, 64};
    int threshold = 70;

    bool allMeet = std::all_of(scores.begin(), scores.end(),
        [threshold](int score) {
            return score >= threshold;
        });
    bool anyMeet = std::any_of(scores.begin(), scores.end(),
        [threshold](int score) {
            return score >= threshold;
        });

    std::cout << "threshold=" << threshold << std::endl;
    std::cout << "allMeet=" << allMeet << std::endl;
    std::cout << "anyMeet=" << anyMeet << std::endl;
    return 0;
}

#include <algorithm>
#include <iostream>
#include <vector>

int main() {
    std::vector<int> scores{72, 85, 91, 64};
    int threshold = 60;

    bool allMeet = std::all_of(scores.begin(), scores.end(),
        [threshold](int score) {
            return score >= threshold;
        });
    bool anyMeet = std::any_of(scores.begin(), scores.end(),
        [threshold](int score) {
            return score >= threshold;
        });

    std::cout << "threshold=" << threshold << std::endl;
    std::cout << "allMeet=" << allMeet << std::endl;
    std::cout << "anyMeet=" << anyMeet << std::endl;
    return 0;
}

#include <algorithm>
#include <iostream>
#include <vector>

int main() {
    std::vector<int> scores{72, 85, 91, 64};
    int threshold = 90;

    bool allMeet = std::all_of(scores.begin(), scores.end(),
        [threshold](int score) {
            return score >= threshold;
        });
    bool anyMeet = std::any_of(scores.begin(), scores.end(),
        [threshold](int score) {
            return score >= threshold;
        });

    std::cout << "threshold=" << threshold << std::endl;
    std::cout << "allMeet=" << allMeet << std::endl;
    std::cout << "anyMeet=" << anyMeet << std::endl;
    return 0;
}

  1. scores ← [72, 85, 91, 64], threshold ← 70, allMeet ← 0, anyMeet ← 1

    5int main() {6    std::vector<int> scores→ [72, 85, 91, 64]{72, 85, 91, 64};7    int threshold→ 70 = 70; //@threshold=60, 9089    bool allMeet→ 0 = std::all_of(scores[72, 85, 91, 64].begin(), scores.end(),10        [threshold](int score) {11            return score >= threshold;12        });13    bool anyMeet→ 1 = std::any_of(scores[72, 85, 91, 64].begin(), scores.end(),14        [threshold](int score) {15            return score >= threshold;16        });1718    std::cout << "threshold=" << threshold70 << std::endl;19    std::cout << "allMeet=" << allMeet0 << std::endl;20    std::cout << "anyMeet=" << anyMeet1 << std::endl;21    return 0;22}
    outputthreshold=70
allMeet=0
anyMeet=1

  1. scores ← [72, 85, 91, 64], threshold ← 60, allMeet ← 1, anyMeet ← 1

    5int main() {6    std::vector<int> scores→ [72, 85, 91, 64]{72, 85, 91, 64};7    int threshold→ 60 = 60;89    bool allMeet→ 1 = std::all_of(scores[72, 85, 91, 64].begin(), scores.end(),10        [threshold](int score) {11            return score >= threshold;12        });13    bool anyMeet→ 1 = std::any_of(scores[72, 85, 91, 64].begin(), scores.end(),14        [threshold](int score) {15            return score >= threshold;16        });1718    std::cout << "threshold=" << threshold60 << std::endl;19    std::cout << "allMeet=" << allMeet1 << std::endl;20    std::cout << "anyMeet=" << anyMeet1 << std::endl;21    return 0;22}
    outputthreshold=60
allMeet=1
anyMeet=1

  1. scores ← [72, 85, 91, 64], threshold ← 90, allMeet ← 0, anyMeet ← 1

    5int main() {6    std::vector<int> scores→ [72, 85, 91, 64]{72, 85, 91, 64};7    int threshold→ 90 = 90;89    bool allMeet→ 0 = std::all_of(scores[72, 85, 91, 64].begin(), scores.end(),10        [threshold](int score) {11            return score >= threshold;12        });13    bool anyMeet→ 1 = std::any_of(scores[72, 85, 91, 64].begin(), scores.end(),14        [threshold](int score) {15            return score >= threshold;16        });1718    std::cout << "threshold=" << threshold90 << std::endl;19    std::cout << "allMeet=" << allMeet0 << std::endl;20    std::cout << "anyMeet=" << anyMeet1 << std::endl;21    return 0;22}
    outputthreshold=90
allMeet=0
anyMeet=1